1 (16 oz.) pkg. white cake mix
1 stick butter
1 (16-18 oz.) can pie filling
1 egg
1 c. sour cream

Blend cake mix with butter. Pat into greased 9 x 13 inch cake pan. Bake at 350 degrees for 10 minutes. Spread pie filling onto crust. Beat egg into sour cream and then spread over pie filling. Bake 25 minutes at 350 degrees. Cool. Serve.