1 can pie filling (any flavor)
1 yellow cake mix
1 cube butter
1 tub Cool Whip

Preheat oven to 350°F. Spread pie filling into bottom of large (at least 13 or 14 inches) pie plate. In a large mixing bowl, cut softened butter into yellow cake mix. Spread this mixture over pie filling.

Bake 45 minutes. Top with Cool Whip when serving.