Best Lemon Squares

Step 1
Preheat oven to 350 degrees F (175 degrees C). Spray a 9×13-inch baking dish with cooking spray.

Step 2
Process 2 cups flour, butter, and 1/2 cup confectioners' sugar in a food processor until mixture resembles coarse crumbs; press into the prepared baking dish.

Step 3
Bake in the preheated oven until the edges of the crust are golden brown, 18 to 22 minutes. Cool crust to room temperature.

Step 4
Beat white sugar, eggs, 1/4 cup flour, lemon juice, baking powder, and lemon zest together in a bowl using an electric mixer until light and fluffy; pour onto the cooled crust.

Step 5
Bake in the oven until custard is set, 25 to 28 minutes. Cool lemon squares completely; dust the top with more confectioners' sugar.