Peanut Butter Swirl Bars
["1/2 c. peanut butter", "1/2 c. margarine", "3/4 c. brown sugar", "2 eggs", "1 tsp. vanilla", "1 c. flour", "1/2 tsp. salt", "1 tsp. baking powder"]
["Combine first 5 ingredients.", "Add remaining dry ingredients. Sprinkle 1 cup chocolate chips and 1/2 to 1 cup chopped nuts on top.", "Place in oven for 5 minutes.", "Remove and run knife through to marbleize.", "Bake for 25 to 30 minutes at 350\u00b0."]
["peanut butter", "margarine", "brown sugar", "eggs", "vanilla", "flour", "salt", "baking powder"]