2 (21 ounce) cans apple pie filling
1 (15.25 ounce) package yellow cake mix
½ cup butter, melted
Preheat oven to 350 degrees F (175 degrees C).
Pour pie filling into a 9×13-inch baking dish. Sprinkle cake mix evenly over apple pie filling and top with melted butter.
Bake in the preheated oven until the top starts to turn brown, about 40 minutes. Cool cake 15 minutes before serving.