Chocolate Chip Brownies
["2 c. all-purpose flour", "1 tsp. baking powder", "1/4 tsp. baking soda", "1 tsp. salt", "2/3 c. margarine", "2 c. brown sugar", "2 eggs, slightly beaten", "2 tsp. vanilla", "1 c. chocolate chips", "1/3 c. chopped nuts"]
["Mix flour, soda, baking powder and salt.", "Set aside.", "Melt margarine in saucepan.", "Add sugar.", "Blend in eggs and vanilla.", "Add flour mixture gradually, mixing well.", "Spread in a 13 x 9-inch pan. Sprinkle with chocolate chips and nuts.", "Bake at 350\u00b0 for 30 minutes.", "Cool in pan.", "Cut in bars.", "Makes 48."]
["flour", "baking powder", "baking soda", "salt", "margarine", "brown sugar", "eggs", "vanilla", "chocolate chips", "nuts"]