2 (21 oz.) cans apple pie filling
1 (7 oz.) apple cinnamon muffin mix (Martha White)
1/2 stick butter

Grease bowl with butter. Pour pie filing in 9 x 10 inch casserole dish. Melt butter - mix in with muffin mix. Crumble on top of apple pie filling. Bake at 350 degrees for 30 minutes or until brown on top. Serve warm.