These Southern Chess Squares are a 5-ingredient gooey butter bar that's impossibly simple and irresistibly good. A classic Southern dessert ready in under an hour!
Preheat oven to 300°F. Line a 9x13-inch baking dish (or an 11x11-inch as shown in the photos) with parchment paper or lightly grease.
In a large bowl, mix together the 15.25 ounce box of cake mix, ½ cup melted butter, and 1 egg until combined. Press evenly into the bottom of the pan to form the crust.
In another bowl, beat the 8 ounces softened cream cheese until smooth. Add the remaining 2 eggs and 1 teaspoon vanilla extract (if using), mixing until combined. Gradually add the 16 ounces powdered sugar and beat until smooth and creamy.
Pour the cream cheese mixture over the crust and spread into an even layer.
Bake for 40–45 minutes or until the edges are golden brown and the center is just set but still slightly jiggly.
Cool completely before slicing into squares. For best results, chill before slicing.
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Notes
Melt the butter and allow it to come to room temperature before using it in the recipe.
Allow the cream cheese and eggs to come to room temperature before beginning the recipe for easier mixing.
Make the crust and filling mixture with a stand mixer or a large bowl with a hand mixer to make the process easier.
Allow the chess squares to cool completely before cutting.