Peanut Butter Swirl Bar
["1 c. peanut butter", "2/3 c. butter", "1 1/2 c. brown sugar", "1 1/2 c. white sugar", "4 eggs", "1 Tbsp. vanilla", "2 c. flour", "2 tsp. baking powder", "1 1/2 tsp. salt"]
["Mix and spread in pan and sprinkle with chocolate chips.", "Bake at 350\u00b0 for 30 minutes. Cut into bars.", "It's a favorite at the high school."]
["peanut butter", "butter", "brown sugar", "white sugar", "eggs", "vanilla", "flour", "baking powder", "salt"]