1. Preheat the oven to 350F. Coat a 9-inch springform pan with cooking spray.
2. Combine 1 cup sugar and the butter in a large bowl. Beat with an electric mixer on high speed until light and fluffy. Add the sour cream and eggs; beat until blended.
3. Mix the flour, baking powder, baking soda and salt in a small bowl. Add to the butter mixture; beat until blended. Stir in the apples. Spread the batter in the prepared pan. Combine the remaining 1/4 cup sugar and the cinnamon in a small bowl. Sprinkle over the batter in the pan.
4. Bake the coffee cake until a toothpick inserted in the center comes out clean, 55 to 65 minutes. Cool in the pan on a wire rack 10 minutes. Remove the side of the pan. Serve warm or cool.
Village Tips
*Springform pans have a removable side, which is held in place by a spring. This makes it easier to remove the cake from the pan. If a springform pan is not available, the coffee cake can be baked in a greased 9-inch round baking pan.
*Either tart Granny Smith or tangy, sweet Golden Delicious apples work well in this recipe.