First - the crust. Using a pastry cutter, blend all 3 crust ingredients together until you have a nice dough. Press it into the bottom of a greased 9x13 pan and bake for 20 minutes, until it's slightly browned.
While your crust is baking, beat together your filling ingredients. Beat on low speed for 1-2 minutes.
When the crust is done, pour the filling mixture over the crust and return to the oven to bake for an additional 20 minutes - until the filling has set. A note here - it's easy to forget your pan is hot when you add the raw filling, so handle your pan with care. (Don't ask why I feel the need to point this out, LOL.)
Cool completely, and sprinkle with a bit of powdered sugar if you would like. Cut into bars. If you are removing them from the pan and packing them to take somewhere, you should place a piece of wax paper between stacked bars.
Recipe by Happy Hour Projects at https://happyhourprojects.com/lemon-pie-bars/