1/2 c. butter
1 pkg. yellow cake mix
3 c. sliced apples
1/2 c. sugar
1 tsp. cinnamon
1 c. sour cream
1 egg

Heat oven to 350 degrees. Cut butter into dry cake mix until crumbly. Pat mixture into ungreased 9 x 13 inch pan. Bake 10 minutes. Arrange apples on warm crust. Combine sugar and cinnamon. Sprinkle on apples. Blend sour cream and egg. Drizzle over apples. Bake 25 minutes. Serve warm.