A buttery shortbread crust topped with lemon filling.
Preheat the oven to 350. Butter and flour an 8x8 pan. Mix ingredients for the crust. Press into pan, and bake for 20 minutes. Remove from oven. Combine flour, baking powder, and salt in a medium bowl. Set aside. Beat eggs and sugar in a large mixing bowl. Add lemon juice. Fold in flour mixture. Mix until incorporated. Pour the filling mixture over the crust evenly. Bake for 20 minutes. Remove from oven and allow to cool completely. Sift confectioner sugar over the bars. Refrigerate until ready to serve.