1 (18.25 ounce) box yellow cake mix
1 small box instant vanilla pudding
1 cup sour cream
4 whole eggs
1/2 cup vegetable oil
1/2 cup milk

Blend cake mix and pudding. Add rest of ingredients. Beat all together for 10 minutes at medium speed with electric mixer.

Topping
3 teaspoons cinnamon
1/4 cup granulated sugar
1 tablespoon flour
Nuts or chocolate chips (optional)

Mix together. Pour half of the batter in a greased angel food pan. Sprinkle half of the topping on the batter; cut in and add remaining batter and sprinkle with the remaining topping on cake.

Bake at 350 degrees F for 50 minutes or until it passes the clean wooden pick test.