Prepare the Baking Dish
Preheat the oven to 350°F (175°C). Take a 9x13-inch baking dish and thoroughly grease it with butter or cooking spray to prevent sticking. This ensures easy serving and cleanup after baking.
Create the Lemon Base
Spread the lemon pie filling evenly across the bottom of the prepared baking dish. Use a spatula to create a uniform layer that will become the tangy foundation of your dessert.
Add the Cream Cheese Layer
Beat the softened cream cheese in a small bowl until completely smooth and free of lumps. Using a spoon, drop dollops of the cream cheese over the pie filling, distributing them evenly throughout the dish.
Apply the Cake Mix
Sprinkle the dry lemon cake mix evenly over the cream cheese layer. Be sure to cover the entire surface but do not stir or mix the layers together. The cake mix will form a crumbly topping as it bakes.
Add the Butter
Pour the melted butter evenly over the cake mix layer, trying to cover as much of the dry mix as possible. The butter will help the cake mix turn golden and crisp during baking.
Bake to Perfection
Bake for 35-40 minutes, until the top is golden brown and the edges are bubbling. The cake should look set but might still have some soft spots in the center, which will firm up as it cools.
Cool and Serve
Let the cake cool slightly before serving, about 15-20 minutes. This dessert can be enjoyed warm or at room temperature. For an extra touch, consider adding optional toppings such as whipped cream, a dusting of powdered sugar, or fresh berries.