Irresistible Brownies
["3/4 c. butter or margarine", "2 c. sugar", "1 1/2 c. flour", "1/2 c. cocoa", "1/2 tsp. baking powder", "1/4 tsp. salt", "4 eggs", "2 tsp. vanilla", "2 c. semi-sweet chocolate chips"]
["Preheat oven to 350\u00b0.", "In a 3-quart pan over low heat, melt butter.", "Remove from heat.", "Add sugar, flour, cocoa, baking powder, salt, eggs and vanilla; stir with spoon until batter is well blended.", "Stir in 1 1/2 cups chips.", "Spread in a 13 x 9-inch pan.", "Sprinkle with remaining chips.", "Bake for 30 to 35 minutes. Cool on wire rack."]
["butter", "sugar", "flour", "cocoa", "baking powder", "salt", "eggs", "vanilla", "semi-sweet chocolate chips"]