I use this one from All Recipes to make Chess Squares. I try various cake mixes for different flavors. Lemon is good, so is Carrot Cake. The last batch I made was with a Spice cake recipe. It was probably the best.

I will add to the directions. I use parchment paper to line the baking pan. When you remove the pan from the oven, you will think that it isn't done yet, ignore that. I let the pan cool, usually by putting it in a baking pan with water. After it has cooled down, I put it in the freezer for almost an hour. This firms up the top part.

If you like cheesecake, you will love this recipe.