Preheat oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish with cooking spray or butter.

In a large bowl, combine the yellow cake mix and melted butter. Mix with a fork until the mixture resembles coarse crumbs.

Spread half of the crumb mixture evenly over the bottom of the baking dish and press it down to form a base.

In a separate bowl, whisk together softened cream cheese and lemon pie filling until smooth.

Pour the lemon cream cheese filling over the crumb base and spread evenly.

Sprinkle the remaining crumb mixture evenly over the filling layer.

Bake in the preheated oven for 40-45 minutes, until golden on top and set in the center.

Let the cake cool slightly before slicing. Optional: dust with powdered sugar or add whipped cream.