There’s something incredibly comforting about waking up to the aroma of a hearty breakfast casserole baking in the oven. Honestly, it feels like a warm hug from the kitchen. I remember my grandmother making her famous egg bake for every single holiday morning, and the memory of all of us gathered around the table, still in our pajamas, is a treasure. That’s the magic of this dish; it’s more than just food, it’s a centerpiece for making memories. Whether you’re feeding a hungry crowd on Christmas morning or prepping an easy weekday breakfast, a good breakfast casserole is a lifesaver. Today, I’m sharing my ultimate, go-to recipe that never fails to impress. It’s a beautiful, cheesy sausage breakfast casserole that’s simple to put together and always delivers on flavor.

Why This Breakfast Casserole is a Total Game-Changer

This particular breakfast casserole recipe hits all the right notes for a truly satisfying meal. First of all, the combination of savory sausage, sweet peppers, and sharp cheddar cheese creates a perfect harmony of flavors that everyone loves. Meanwhile, the custard base, made with eggs and whole milk, turns incredibly creamy and rich as it bakes, binding everything together. Ultimately, using day-old bread is the secret weapon here; it soaks up the custard without turning mushy, giving you a texture that’s both tender and substantial. This is one of those simple breakfast casserole recipes that feels fancy but is genuinely easy to pull off, making it a reliable star for any brunch table.

The Secret to the Perfect Custard Texture

Achieving that dreamy, set-yet-moist custard is easier than you think. The key is the ratio of eggs to milk and a little patience. For instance, using large eggs and whole milk provides the right amount of fat for a luxuriously creamy result. Furthermore, the dry mustard powder is my little secret; it doesn’t make the casserole taste like mustard, but it adds a subtle tangy depth that cuts through the richness. Consequently, you get a beautifully puffed and golden brown top with a soft, almost quiche-like interior that holds its shape when sliced.

Why Sausage and Peppers are a Classic Combo

This dynamic duo is a classic for a reason. The savory, slightly spicy flavor of bulk breakfast sausage pairs wonderfully with the sweet crunch of red bell pepper and the aromatic softness of sautéed onion. As you cook the sausage first, you render out its flavorful fat, which you then use to cook the vegetables. This process infuses the entire dish with a deep, meaty flavor that permeates every single bite. It’s a foundational flavor profile that makes this sausage breakfast casserole so incredibly comforting and familiar.

Gathering Your Breakfast Casserole Ingredients

Using high-quality ingredients makes a noticeable difference in the final result. For the base, I always opt for unsalted butter to control the salt level, and a flavorful bulk breakfast sausage is a must. A good sharp cheddar cheese, freshly shredded from a block, melts better and tastes far superior to pre-shredded varieties, which often contain anti-caking agents. Don’t be tempted to skip the dry mustard powder; it’s the ingredient that elevates this from a good breakfast egg bake to a great one. It’s one of those small touches that makes a big impact, much like the techniques in my recipe for garlic parmesan chicken meatloaf.

Choosing the Right Bread for Your Base

The bread you choose is the foundation of your casserole. A sturdy, day-old bread is ideal because it’s had time to dry out slightly. This staleness allows it to absorb the egg custard like a sponge without disintegrating. I often use a good French or Italian loaf, but even a simple white sandwich bread works perfectly. Conversely, avoid using very soft, fresh bread, as it can become too soggy. Tearing the bread into rustic chunks, rather than cutting it into perfect cubes, creates nooks and crannies that grab onto the custard and toppings, ensuring every bite is flavorful.

The Importance of Fresh Vegetables and Dairy

Freshness matters, especially with your vegetables and dairy. A crisp red bell pepper and a firm yellow onion will sauté to a perfect tender-crisp texture, adding bursts of color and sweetness. Meanwhile, using fresh, large eggs and whole milk is non-negotiable for that rich, custardy consistency. The fat in whole milk is essential for a luscious mouthfeel that lower-fat milks can’t provide. For another dish where fresh ingredients shine, check out my creamy garlic pasta recipe.

Step-by-Step Instructions for Breakfast Casserole Success

Following these steps carefully will guarantee a perfect breakfast casserole every single time. First, preheating your oven and properly greasing the baking dish is crucial to prevent sticking and ensure even cooking. Then, browning the sausage properly is your first layer of flavor development. After that, sautéing the onions and peppers in the rendered sausage fat builds an incredible flavor base. Finally, the resting period after assembling the casserole is not a step to skip; it gives the bread time to fully absorb the custard, which is the secret to a uniform texture without dry spots.

Weekend Sausage Cheddar Breakfast Casserole

This easy breakfast casserole is loaded with savory sausage and cheddar cheese, baked to golden perfection for a crowd-pleasing weekend brunch or holiday morning.

Print Recipe Pin Recipe

Prep Time 25 minutes mins

Cook Time 55 minutes mins

Total Time 1 hour hr 30 minutes mins

Course Breakfast, Brunch

Cuisine American

Servings 8 servings

Calories 450 kcal

Equipment

• 9x13-inch baking dish
• large skillet
• spoon
• slotted spoon
• mixing bowl
• whisk
• spatula
• wire rack
• measuring spoons
• measuring cups
• cutting board
• knife
• oven

Ingredients

  

Casserole Base

• 1 tablespoon unsalted butter
• 1 pound bulk breakfast sausage
• 1 medium yellow onion finely diced
• 1 red bell pepper finely diced
• 8 large eggs
• 2 cups whole milk
• 1 teaspoon kosher salt
• 1/2 teaspoon freshly ground black pepper
• 1 teaspoon dry mustard powder
• 6 cups cubed day-old bread about ½-inch pieces
• 2 cups shredded sharp cheddar cheese divided

Instructions

 

• Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking dish with the 1 tablespoon of unsalted butter.
• In a large skillet over medium-high heat, cook 1 pound of bulk breakfast sausage, breaking it up with a spoon until it is browned and no longer pink, which should take about 8-10 minutes. Use a slotted spoon to transfer the cooked sausage to a paper towel-lined plate to drain, leaving about 1 tablespoon of drippings in the skillet.
• Add the finely diced yellow onion and red bell pepper to the skillet with the drippings. Sauté over medium heat for about 5-7 minutes, stirring occasionally, until the vegetables have softened.
• In a large mixing bowl, whisk together the 8 large eggs, 2 cups of whole milk, 1 teaspoon of kosher salt, ½ teaspoon of black pepper, and 1 teaspoon of dry mustard powder until the mixture is completely smooth and uniform.
• Spread the 6 cups of cubed bread evenly in the bottom of the prepared baking dish. Top with the cooked sausage and sautéed vegetable mixture. Sprinkle 1 ½ cups of the shredded cheddar cheese over the top.
• Slowly and evenly pour the egg mixture over the contents in the baking dish, ensuring all the bread is moistened. Gently press down on the top with a spatula to help the bread absorb the liquid. Let the dish stand for 10 minutes so the bread can soak up the custard.
• Sprinkle the remaining ½ cup of shredded cheddar cheese over the top. Bake in the preheated oven for 45-55 minutes, or until the casserole is puffed, the center is fully set (doesn't jiggle when shaken), and the top is a deep golden brown.
• Remove the casserole from the oven and let it rest on a wire rack for 10 minutes before slicing and serving. This allows the layers to set for clean cuts.

Notes

Let the dish stand for 10 minutes after adding the egg mixture so the bread can soak up the custard. Let it rest for 10 minutes after baking for clean cuts.

Keyword breakfast casserole, cheddar cheese, sausage

Mastering the Assembly and Soaking Time

Assembly is where the magic happens. Layering the ingredients correctly ensures every serving has a bit of everything. Start with the bread cubes, then evenly distribute the sausage and veggie mixture. Next, sprinkle a generous amount of cheese before slowly pouring the custard over everything. The final, critical step is to let the assembled casserole sit for at least 10 minutes. During this time, gently press down on the bread with a spatula to help it submerge and soak. This patience pays off with a cohesive, delicious final product.

Baking to Golden Brown Perfection

Baking is the final transformation. You’ll know your breakfast casserole is done when the edges are bubbly, the top is a deep, golden brown, and the center is fully set. To test, gently jiggle the dish; the center should have only a slight wobble. Alternatively, you can insert a knife into the center; if it comes out clean, the custard is set. Remember, the casserole will continue to cook slightly as it rests outside the oven. Letting it rest for 10 minutes before slicing is essential, as it allows the structure to firm up, making it easy to cut into neat squares.

Brilliant Make-Ahead Breakfast Casserole Strategies

The beauty of this dish is its fantastic make-ahead potential, making it a superstar for busy mornings and special occasions alike. You can prepare the entire sausage breakfast casserole the night before, cover it tightly, and refrigerate it. Then, simply pop it in the oven in the morning—no fuss, no stress. This overnight breakfast casserole method actually allows the flavors to meld even more deeply. It’s the ultimate solution for a relaxed Christmas morning breakfast casserole, giving you more time to enjoy the moment with your family instead of being stuck in the kitchen.

Overnight Preparation for Effortless Mornings

For an overnight breakfast casserole, follow all the steps up to the point of baking. After you’ve poured the egg mixture over the bread and toppings, cover the baking dish tightly with plastic wrap or a lid. Place it in the refrigerator for up to 12 hours. When you’re ready to bake, take the casserole out of the fridge while the oven preheats to take the chill off. You may need to add a few extra minutes to the baking time since you’re starting with a cold dish. This method is as convenient as my fudgy chewy brownies for a last-minute dessert.

Prepping Components in Advance

If you prefer not to assemble the entire casserole ahead, you can still save time by prepping individual components. You can cook the sausage and sauté the onions and peppers a day or two in advance. Store them in separate airtight containers in the refrigerator. You can also shred the cheese and cube the bread ahead of time. When you’re ready to bake, simply assemble the layers with your prepped ingredients, whisk the custard, and proceed. This approach gives you the flexibility of a make ahead breakfast casserole with the option for a freshly assembled bake.

Customizing Your Breakfast Bake Endlessly

One of the best things about a basic breakfast casserole recipe is its flexibility. You can easily adapt it to suit your tastes or what you have on hand. For a vegetarian breakfast casserole, simply omit the sausage and add in sautéed mushrooms, spinach, or meatless crumbles. If you’re aiming for a healthier breakfast casserole, you can use whole wheat bread, reduced-fat cheese, and turkey sausage. Love bacon? A bacon egg casserole is just a simple swap away. The formula is forgiving, so feel free to get creative with your favorite ingredients.

Ingredient Substitutions and Add-Ins

Don’t be afraid to mix and match ingredients based on your preferences. Instead of cheddar, try Gruyère, Monterey Jack, or a pepper jack for a kick. For a potato breakfast casserole, add a layer of thawed frozen hash browns underneath the bread cubes. You can also create a breakfast casserole with biscuits by using refrigerated biscuit dough, cut into pieces, instead of bread. Other fantastic add-ins include diced ham, cooked bacon, sundried tomatoes, or even a handful of fresh herbs like chives or parsley. For a sweet and savory twist, inspired by my churro cheesecake, a dash of maple syrup in the custard is delightful.

Creating Dietary-Friendly Versions

This recipe can be easily modified for various dietary needs. For a gluten-free version, use your favorite gluten-free bread. To make it dairy-free, substitute the butter with oil, use a plant-based milk, and choose a dairy-free cheese that melts well. If you’re watching your sodium intake, use low-sodium sausage and reduce the added salt. The core technique remains the same, allowing everyone to enjoy a delicious, customized breakfast bake. It’s as versatile as the base for my peanut butter bars, which can also be tailored to different diets.

Serving and Presentation Ideas for Your Casserole

Presenting your beautiful breakfast casserole is part of the fun. Once it has rested, slice it into generous squares and serve directly from the baking dish for a cozy, family-style meal. For a more elegant brunch presentation, you can plate individual servings alongside a simple green salad or fresh fruit. A dollop of salsa, a spoonful of sour cream, or a sprinkle of fresh chopped chives on top adds a lovely finishing touch and a burst of fresh flavor. This cheesy breakfast casserole is hearty enough to stand on its own, but it also plays well with others.

Perfect Pairings for a Complete Brunch

To create a full brunch spread, pair your casserole with complementary dishes. A fresh fruit platter or a simple fruit salad provides a light, refreshing contrast. For something sweet, s’mores bars or peach upside-down cakes are fantastic options. A basket of warm cheesy garlic rolls or a side of crispy hash browns would be carb-lover’s dream. Don’t forget the coffee, orange juice, and perhaps a mimosa or two for a truly celebratory feel!

Plating for Family and Guests

Whether it’s a casual family breakfast or a fancy brunch with friends, a little attention to plating goes a long way. Use a spatula to lift out clean squares of the casserole. Wipe the edge of the plate clean for a neat appearance. Garnish with a sprig of fresh parsley or a few thinly sliced scallions to add a pop of color. Serving your brunch casserole recipes with style makes the meal feel extra special and shows your guests you care.

Storing and Reheating Your Leftover Casserole

Fortunately, leftovers of this breakfast casserole are just as delicious as the first serving. Once completely cooled, cover the baking dish tightly with plastic wrap or aluminum foil, or transfer individual portions to airtight containers. It will keep well in the refrigerator for up to 3-4 days. This makes it a fantastic option for meal prepping a quick and easy breakfast for the week ahead. Simply reheat a portion whenever you need a satisfying start to your day.

Best Methods for Reheating

To maintain the best texture, I recommend reheating slices in the oven or a toaster oven. Preheat your oven to 350°F (175°C), place the casserole slice on a baking sheet, and heat for 10-15 minutes, or until warmed through. This method helps re-crisp the edges. Alternatively, you can use a microwave for speed, although the texture will be softer. Place a slice on a microwave-safe plate and heat on high in 30-second intervals until hot. For a treat that reheats just as beautifully, my brown butter brookie is a great choice.

Can You Freeze a Breakfast Casserole?

Yes, you can freeze this casserole for longer storage. I recommend freezing it after baking and cooling. Cut the entire casserole into individual portions, wrap each piece tightly in plastic wrap, and then place them in a freezer-safe bag or container. It will keep for up to 2 months. To reheat, thaw overnight in the refrigerator and then follow the oven reheating instructions above. You can also reheat from frozen, but you will need to add more time and cover it with foil to prevent over-browning while the center warms up.

Perfect Occasions for Your Breakfast Casserole

This versatile dish is truly perfect for any gathering where good food and good company are the main events. It’s the undisputed champion of holiday mornings, especially for a stress-free Christmas morning breakfast casserole. But its usefulness extends far beyond that. Think of it for weekend brunch parties, baby showers, overnight guests, or even a comforting weekend family breakfast. It’s a reliable, crowd-pleasing recipe that fits seamlessly into so many moments of life.

Holiday Mornings and Special Gatherings

For holidays like Christmas, Easter, or Mother’s Day, a make ahead breakfast casserole is a gift to yourself. It allows you to be present with your loved ones instead of being stuck in the kitchen. The comforting, celebratory nature of the dish makes the morning feel special. Pair it with other easy favorites like chewy lemon cookies for dessert, and you have a memorable meal with minimal last-minute effort.

Easy Weekday Meals and Potlucks

Don’t relegate this recipe to weekends and holidays only. By preparing it on a Sunday, you can have a ready-made, protein-packed breakfast for the entire week. It’s also a fantastic dish to bring to a potluck or a school function because it travels well and feeds a crowd. Whether it’s a cozy family meal or a large community event, this easy breakfast casserole is always a welcome addition to the table. For more inspiration on fantastic breakfast ideas, browse our full collection of breakfast recipes.

Frequently Asked Questions

What to Remember About This Breakfast Casserole

This breakfast casserole is more than just a recipe; it’s a reliable tool for creating warm, joyful moments around the table. Its simplicity, make-ahead convenience, and incredible versatility make it a true keeper. I hope this recipe becomes a beloved staple in your home, just as it is in mine, creating its own set of cherished memories for years to come. Now, I’d love to hear from you! What are your favorite add-ins or family variations? Share your thoughts in the comments below!