My Grandma's Coffee Cake recipe
For the streusel topping:
- 1/2 cup all-purpose flour
- 1/2 cup packed brown sugar
- 1 teaspoon ground cinnamon
- 1/4 cup cold unsalted butter cut into small pieces
For the cake:
- 2 cups all-purpose flour
- 1 cup granulated sugar
- 2 teaspoons baking powder
- 1/2 teaspoon baking soda
- 1/4 teaspoon salt
- 1/2 cup unsalted butter softened
- 2 eggs
- 1 cup sour cream
- 1 teaspoon vanilla extract