To make lemon squares like the ones made by Paula Deen, follow her recipe at FoodNetwork.com. The recipe includes making a crust with butter, flour and sugar and baking with a filling consisting of eggs, sugar, flour and lemon juice.
To start, make the crust by whisking together 2 cups of all-purpose flour, 1 cup of confectioner's sugar and a pinch of salt. Mix in two sticks of softened unsalted butter cut into pieces until a crumbly dough forms. Transfer the dough into a baking dish lined with aluminum foil and greased. Press the dough into the dish, distributing it in a single even layer along the bottom. Bake for 20 minutes in an oven preheated at 350 degrees Fahrenheit. Transfer the food to a wire rack to cool.
Make the filling by mixing four large eggs with 2 cups of granulated sugar and 6 tablespoons of all-purpose flour in a bowl. Stir in 6 tablespoons of fresh lemon juice, pour the filling over the prebaked crust, and bake in the 350-degree oven for 25 more minutes. Transfer to a wire rack to cool and top with more confectioner's sugar. Lift the lemon cake out of the pan, and cut it into uniform pieces for serving.