Preheat oven to 350°F (175°C) and spray a 9x13-inch baking dish with nonstick cooking spray.
Spread the lemon pie filling evenly on the bottom of the baking dish.
Sprinkle half of the cake mix over the pie filling.
Distribute the cubed cream cheese evenly over the cake mix layer.
Sprinkle the remaining cake mix over the cream cheese.
Evenly space out small pieces of butter on top of the cake mix.
Bake for 35-45 minutes, until the top is golden brown and fully set.
Serve warm with whipped topping and enjoy!