Peanut Butter Swirl Bars
["1/2 c. crunchy peanut butter", "1/3 c. softened butter", "1/2 c. brown sugar", "1/2 c. granulated sugar", "2 eggs", "2 tsp. vanilla", "1 c. flour", "1 tsp. baking powder", "1/4 tsp. salt", "12 oz. (2 c.) chocolate chips"]
["Preheat oven to 350\u00b0.", "In large bowl, combine peanut butter, butter, brown sugar and granulated sugar.", "Beat until creamy. Gradually beat in eggs and vanilla.", "In small bowl, combine flour, baking powder and salt.", "Blend in peanut butter mixture.", "Spread into a greased 13 x 9-inch baking pan.", "Sprinkle chocolate chips over surface.", "Place in a 350\u00b0 oven for 5 minutes.", "Remove from oven; run knife through mixture to marbleize.", "Bake an additional 30 minutes.", "Cool; cut into 2 x 1-inch bars.", "Makes 4 dozen."]
["crunchy peanut butter", "butter", "brown sugar", "sugar", "eggs", "vanilla", "flour", "baking powder", "salt", "chocolate chips"]