Brew 2 cups of strong coffee using your preferred method and pour it into a large mug while still hot.
Add 1/4 cup sour cream to the hot coffee and whisk vigorously with a small wire whisk until the sour cream is completely dissolved and the mixture appears smooth and creamy.
Stir in 2 tablespoons of granulated sugar until fully dissolved, tasting and adding more if desired for sweetness.
Add 1/4 cup whole milk and 1/4 teaspoon ground cinnamon to the coffee mixture, stirring gently to combine all ingredients thoroughly.
Top with a generous dollop of whipped cream and an extra sprinkle of cinnamon before serving immediately.
Notes
Top with a generous dollop of whipped cream and an extra sprinkle of cinnamon before serving immediately.