- 3/4 cup butter, softened, divided
- 2 cups white sugar, divided
- 3 eggs
- 1 tablespoon clear imitation vanilla extract
- 2 1/2 cups all-purpose flour
- 2 1/2 teaspoons baking powder
- 1/2 teaspoon salt
- 1 1/4 cups sour cream
- 1 cup brown sugar
- 1 tablespoon ground cinnamon
- Preheat oven to 325 degrees F (165 degrees C).
- Grease a fluted tube pan (such as Bundt(R)) with 2 tablespoons butter. Add 1/4 cup sugar; shake pan gently until sides are evenly coated with sugar.
- Combine remaining 2/3 cup butter and 1 3/4 cup sugar in a large bowl; beat with an electric mixer until light and fluffy. Add eggs one at a time, beating well after each addition. Mix in vanilla extract.
- Mix flour, baking powder, and salt together in a bowl. Beat flour mixture into the butter mixture alternately with sour cream, beginning and ending with flour mixture and beating batter well after each addition.
- Mix brown sugar and cinnamon together in a small bowl.
- Pour 1/3 of the batter into the prepared pan. Sprinkle 1/2 of the brown sugar-cinnamon mixture over the batter. Repeat once more. Pour remaining batter on top. Swirl batter with a butter knife.
- Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 1 hour. Cool in the pan for 5 minutes; invert onto a wire rack to cool completely.