1 pkg. yellow cake mix
1/2 c. melted butter
1 can apple pie filling
1 c. sour cream
1 egg
1/2 c. sugar
1 tsp. cinnamon

Mix cake mix and melted butter and press into greased 9 x 13 inch pan. Bake for 10 minutes. Pour pie filling onto warm crust. Mix egg and sour cream. Drizzle over apples. Mix sugar and cinnamon; sprinkle over mixture. Bake for 25-30 minutes.