What you need:
2 cups flour
1/2 cup powdered sugar
2 sticks or 1 cup butter (softened)
Whip softened butter and then add powdered sugar and flour. Mix thoroughly, like a pie dough. Pat into a greased 9x13 inch pan. Bake at 350 degrees for 20 minutes or until slightly brown around the edges.
Filling (meanwhile mix)
2 cups sugar
4 beaten eggs
juice of two lemons or 4-6 tablespoons lemon juice, depending on how lemony you like
4 tablespoons flour
Pinch of salt
After crust is baked, pour filling mixture over the crust and bake for 20 minutes more, at 350 degrees. Let cool and sprinkle with powdered sugar!