Simple Black Forest Torte

5 cups miniature marshmallows
1 pkg. Chocolate cake mix
1 can (21 oz.) Cherry pie filling
1 carton (8 oz.) Frozen whipped topping, thawed

Sprinkle marshmallows in a greased 13x9x2 baking pan. Prepare cake batter according to package directions; pour over the marshmallows. Spoon pie filling over batter. Bake at 350 degrees for 1 hour or until a toothpick inserted near the center comes out clean. Cool. Frost with whipped topping. Store in the refrigerator.