Peanut Butter Swirl Bars
["1/2 c. peanut butter", "1/3 c. butter", "3/4 c. firmly packed brown sugar", "3/4 c. white sugar", "2 eggs", "2 tsp. vanilla", "1 c. flour", "1 tsp. baking powder", "1/4 tsp. salt", "12 oz. pkg. semi-sweet chocolate chips"]
["In a large bowl, combine the first 4 ingredients.", "Beat until creamy.", "Gradually beat in 2 eggs and vanilla.", "In small bowl, combine flour, salt and baking powder.", "Blend into peanut butter mixture.", "Spread into greased 13 x 9 x 2-inch pan.", "Sprinkle chocolate chips over top.", "Bake in a 350\u00b0 oven for 5 minutes. Remove from oven.", "Run knife through to marbleize.", "Return to oven and bake 30 minutes.", "Cool and cut into bars."]
["peanut butter", "butter", "brown sugar", "white sugar", "eggs", "vanilla", "flour", "baking powder", "salt", "semi-sweet chocolate chips"]