Combine the butter, sugar, and flour together in a bowl. Press the mixtures into the bottom of a 9x13 baking pan.
Bake the crust for 15 to 20 minutes or until it’s baked through and golden in color. Remove it from the oven and set it aside while you make the filling. Keep the oven heated to 350°F.
How to Make the Filling
In a large bowl, whisk the sugar and flour together. Add the eggs and lemon juice and stir until well combined. Pour the filling over the crust.
Bake the bars for 20 minutes. Cool them completely (they will thicken as the cool) before slicing and serving. Dust the tops of the bars with powdered sugar, if using.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.