Ingredients:

To make the cake:

1/2 cup (1 stick) softened unsalted butter
1 granulated sugar cup
two huge eggs
1 quart sour cream
1 teaspoon vanilla essence, pure
2 cups regular flour
1 tsp. baking powder
1 tsp. baking soda
For the Cinnamon-Sugar Filling: 1/4 teaspoon salt

1/2 cup packed brown sugar
1 1/2 teaspoon cinnamon powder
Optional: 1/2 cup chopped nuts (e.g., walnuts or pecans)
CONTENT PROMOTED

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1 tablespoon all-purpose flour
1 tablespoon granulated sugar
2 tbsp. softened unsalted butter
1/2 teaspoon cinnamon powder
Instructions:

Preheat the oven to 350 degrees Fahrenheit (175 degrees Celsius). Coat a 9-inch square baking pan with cooking spray and flour.
Cream together the softened butter and granulated sugar in a mixing mixer until light and fluffy.
One at a time, beat in the eggs, then toss in the sour cream and vanilla extract until thoroughly incorporated.
Whisk together the flour, baking powder, baking soda, and salt in a separate dish.
Add the dry ingredients to the liquid components gradually, mixing until just mixed.
Prepare the cinnamon-sugar filling in a small bowl by combining the brown sugar and ground cinnamon. If using nuts, include them into the filling mixture.
Half of the cake batter should be spread into the prepared pan. Half of the cinnamon-sugar filling should be sprinkled over the batter.
Spread the remaining batter evenly over the cinnamon-sugar coating. It’s acceptable if it’s a little difficult; the idea is to make a swirl.
In a small mixing basin, combine the flour, granulated sugar, softened butter, and ground cinnamon for the streusel topping. Make a crumbly mixture using your fingertips or a fork.
Evenly distribute the streusel topping over the cake batter.
Bake the cake for 35-40 minutes in a preheated oven, or until a toothpick inserted into the center comes out clean.
Allow the coffee cake to cool for 10-15 minutes in the pan before moving it to a wire rack to cool fully.
When completely cool, slice and serve. Have fun with your Sour Cream Coffee Cake!
This coffee cake is ideal for breakfast or brunch, especially when served with a steaming cup of coffee.