Lemon Squares
["1 c. all-purpose flour", "1/2 c. butter", "1/4 c. powdered sugar", "2 eggs", "1 c. sugar", "1/2 tsp. baking powder", "1/4 tsp. salt", "2 Tbsp. lemon juice"]
["Heat oven to 350\u00b0.", "Mix flour, margarine and powdered sugar. Press in ungreased square pan, 8 x 8 x 2-inch or 9 x 9 x 2-inch, building up 1/2-inch edges.", "Bake 20 minutes.", "Beat remaining ingredients until light and fluffy, about 3 minutes.", "Pour over hot crust.", "Bake until no indention remains when touched lightly in center, about 25 minutes.", "Cool and cut.", "Option:", "Sprinkle top with powdered sugar before you cut."]
["flour", "butter", "powdered sugar", "eggs", "sugar", "baking powder", "salt", "lemon juice"]