Chocolate Chip Bars
["2 2/3 c. sifted all-purpose flour", "2 1/2 tsp. double acting baking powder", "1/2 tsp. salt", "2/3 c. butter", "2 1/4 c. light brown sugar, packed firmly", "3 eggs", "1 (6 oz.) pkg. semi-sweet chocolate pieces"]
["Preheat oven to 350\u00b0.", "Grease large cookie sheet (15 1/2 x 10 1/2 x 1-inch.", "Sift together flour, baking powder and salt; set aside.", "In large saucepan, melt butter and stir in brown sugar; cool 10 minutes.", "Add eggs, one at a time, beating well after each. Stir in flour mixture and chocolate pieces.", "Blend well and spread in pan.", "Bake 25 to 30 minutes.", "Cool and cut into squares.", "Makes about 3 dozen."]
["flour", "double acting baking powder", "salt", "butter", "light brown sugar", "eggs", "semi-sweet chocolate pieces"]