Mix all crust ingredients together in a mixing bowl to form a dough.
Press dough into the bottom of a greased or parchment lined 9x9 or 13x9 pan.
Bake 15 min at 350 or until golden brown.
Add all filing ingredients to a mixing bowl. Beat with whisk until combined.
Pour filing on top of the crust. Bake for 25 min at 350.
Let bars cool and then sprinkle with extra powdered sugar.