1Heat oven to 350°F. Spray bottom of 13x9-inch (3-quart) glass baking dish with cooking spray.
2Spread pie filling in baking dish. Top with dry cake mix; gently shake pan to distribute evenly. Pour melted butter over top, tilting pan to cover as much of top with butter as possible.
3Bake 42 to 45 minutes or until mostly dry on top and bubbly around edges. Cool 10 minutes before serving. Serve warm with whipped topping or ice cream.