Ingredients 1 (22-ounce) can lemon pie filling 1 (15.25-ounce) package lemon cake mix 1 (8-ounce) package cream cheese, cubed 1/2 cup butter, cut into small pieces 1 (8-ounce) container frozen whipped topping, such as Cool Whip®, thawed Directions Step 1 - Preheat the oven to 350 degrees F. Step 2 - Coat a 9x13-inch baking dish with nonstick cooking spray. Step 3 - Use a spatula to evenly spread the lemon pie filling into the bottom of the prepared baking dish. Step 4 - Evenly sprinkle 1/2 of the cake mix over the lemon pie filling. Step 5 - Add the cream cheese cubes over the cake mix and top with a layer of the remaining cake mix. Step 6 - Top the cake mix with the butter pieces. Step 7 - Bake the cake until the topping is browned and the cake mix is set, about 35-45 minutes. Step 8 - Serve the cake topped with the whipped topping.