Peanut Butter Brownies
["1/2 c. margarine", "1/2 c. crunchy peanut butter", "1 c. packed brown sugar", "1 tsp. vanilla", "2 eggs", "1 c. flour", "1 tsp. baking powder", "1/4 tsp. salt", "1 c. chocolate chips"]
["Beat together margarine, peanut butter and brown sugar.", "Add vanilla, eggs, flour, baking powder and salt.", "Stir in chocolate chips.", "Spread mixture into a greased and floured 13 x 9 x 2-inch pan.", "Bake at 350\u00b0 for 20 to 30 minutes."]
["margarine", "crunchy peanut butter", "brown sugar", "vanilla", "eggs", "flour", "baking powder", "salt", "chocolate chips"]