Preheat the oven to 350 degrees. Spray a 9 x 9 inch baking pan with non-stick spray.
Using your hands, mix all ingredients together until the mixture resembles fine crumbs. Press into the bottom of the prepared baking pan. Bake for 10 minutes or until golden brown. Remove from oven and cool completely.
For the Lemon Filling
Whisk all ingredients together in a large mixing bowl until smooth. Pour over the cooled crust. Gently tap the pan so any bubbles rise to the surface and pop each bubble with a toothpick. Removing the bubbles will make the baked lemon bars smooth and creamy!
Bake for 10 to 20 minutes or until the filling is set and firm. Remove from the oven and cool completely before slicing and serving.