Lemon Squares
["1 c. all-purpose flour", "1/2 c. softened butter", "1/4 c. powdered sugar", "1 c. sugar", "2 eggs", "2 tsp. grated lemon peel (if desired)", "2 Tbsp. lemon juice", "1/2 tsp. baking powder", "1/4 tsp. salt", "powdered sugar"]
["Heat oven to 350\u00b0.", "Mix flour and 1/4 cup powdered sugar. Press in ungreased baking pan, 8 x 8 x 2-inch, building up 1/2-inch sides.", "Bake 20 minutes."]
["flour", "butter", "powdered sugar", "sugar", "eggs", "lemon peel", "lemon juice", "baking powder", "salt", "powdered sugar"]