Cut the base lengthwise into 4 bars, then crosswise into 12 bars to make 48 thin rectangles. Serve chilled. Store in the refrigerator in an airtight container for up to 3 days.

2. Make the Base – In a large bowl, combine 1 box yellow cake mix, 1 egg, and 1/2 cup of melted butter. Mix with an electric mixer until combined — the dough will be thick and crumbly, almost ...

How to Make Lemon Chess Bars (Step-by-Step) 1. Preheat the Oven & Prep the Baking Dish I preheat my oven to 350°F (175°C) and grease a 9x13-inch baking dish with butter or nonstick spray.