Step 1

Arrange a rack in the middle of the oven and heat the oven to 350°F. Lightly coat a 9x13-inch baking dish with unsalted butter.

Step 2

Add 2 (14-ounce) cans whole berry cranberry sauce and 1 (about 21-ounce) can apple pie filling to the baking dish and stir to combine. Layer in the baking dish in the following order on top of the fruit (do not stir together): Sprinkle evenly with 1 (15.25-ounce) box yellow cake mix. Cut 1 1/2 sticks cold unsalted butter into thin slices and arrange over the cake mix in an even layer, covering the entire surface.

Step 3

Bake until golden brown, bubbling, and a crispy crust begins to form, 50 to 55 minutes. Cool for 10 minutes, then serve with vanilla ice cream, if desired.