Preheat the oven to 350°F (175°C)
Grease a 9×13-inch baking dish
Spread 2 cans of fruit pie filling evenly in the dish
Sprinkle dry cake mix evenly over the fruit filling
Pour melted butter evenly over the cake mix
Add chopped nuts if desired
Bake for 45 to 55 minutes until golden and bubbly
Let cool slightly before serving