Chewy Tan Bars
["2/3 c. sifted flour", "1 tsp. baking powder", "1/4 tsp. salt", "1/4 c. margarine", "1/2 c. sugar", "1/2 c. brown sugar", "1 egg", "1 tsp. vanilla", "1/2 c. chopped nuts (optional)"]
["Melt margarine; add sugars, egg and vanilla and beat well. Add nuts; stir in flour, salt and baking powder.", "Spread in an 8-inch square pan.", "Bake at 350\u00b0 for 30 minutes.", "Cool and cut into squares."]
["flour", "baking powder", "salt", "margarine", "sugar", "brown sugar", "egg", "vanilla", "nuts"]