Shortbread
["1/2 lb. margarine", "1/2 c. powdered sugar", "2 c. sifted flour", "1/4 tsp. salt", "1/4 tsp. baking powder"]
["Add dry ingredients and beat with mixer.", "Press in 8-inch cake pan.", "Top with sugar.", "Bake 20 to 25 minutes at 350\u00b0.", "Cut while warm in slices."]
["margarine", "powdered sugar", "flour", "salt", "baking powder"]