Preheat oven to 350 degrees

Spray a 9″ x 13″ baking dish thoroughly with cooking spray. Pour cake mix into pan and top with butter.

Using a fork, push butter into dry mix until it is all incorporated as evenly as possible.

Reserve about 1/4 cup of crumb mixture for topping. Press into an even layer.

Using a large spoon, top batter with dollops of lemon pie filling and then spread the filling evenly over base.

Top filling with reserved crumbs.

Bake for 25-35 minutes until base seems set and begins to turn golden.

Cool dish, then cover and refrigerate before slicing into bars.* Store bars in a covered container in the refrigerator.