A nostalgic American dessert favorite, these gooey butter cake bars feature a rich browned butter crust and a sweet, creamy filling balanced with a touch of flaky sea salt.
Heat your oven to 350 degrees. Line a 13x9 baking pan with aluminum foil or parchment paper with an overhang on the sides, then spray the liner well with cooking spray.
In a small saucepan, melt the butter over medium heat until the milk solids turn golden and the aroma is nutty and toasted. Remove from heat and let cool for a few minutes.
Make the Crust and Filling
In a medium mixing bowl, stir together the yellow cake mix, the cooled browned butter, and 1 egg until a smooth, soft dough forms. Press the dough evenly into the bottom of the prepared pan.
In another bowl, use an electric hand mixer on the lowest setting to blend the powdered sugar, softened cream cheese, 2 eggs, vanilla, and coconut extract until smooth and creamy.
Pour the filling over the crust and spread it gently with a spoon to reach the edges in an even layer.
Bake and Finish
Bake for about 40 minutes until the bars are puffed and golden on the edges, while the center still has a slight jiggle. Scatter a pinch of flaky sea salt over the top immediately after removing from the oven.
Cool, Chill, and Slice
Let the pan cool completely on a rack. Refrigerate until very cold and firm, preferably overnight. Lift the slab out using the liner overhang and cut into small squares.
Notes
Storage Tip: Store leftovers in an airtight container in the refrigerator for up to 1 week. These bars must be kept cold because of the cream cheese and eggs.Pro Slicing Tip: For the cleanest, bakery-style edges, use a pizza cutter or a sharp knife dipped in hot water and wiped clean between every single cut.Texture Note: Do not be alarmed if the top cracks as the bars cool. This is normal as the puffed filling settles into its signature dense and gooey texture.Freezing Instructions: Wrap the uncut slab or individual squares tightly in plastic wrap and foil. Freeze for up to 3 months and thaw overnight in the refrigerator before serving.Nutrition information is estimated based on common ingredients and serving sizes and may vary.