Peanut Butter Brownies
["1/2 c. peanut butter", "1/3 c. butter", "1 c. sugar", "1/4 c. brown sugar", "2 eggs", "1 c. all-purpose flour", "1 tsp. baking powder", "1/4 tsp. salt", "1 (6 oz.) pkg. semi-sweet chocolate chips", "1/2 tsp. vanilla"]
["Beat first 2 ingredients until blended.", "Gradually add sugar and beat until fluffy.", "Add eggs, one at a time, beating well after each.", "Add dry ingredients and mix well.", "Stir in chocolate chips and vanilla.", "Spread in buttered 9-inch square pan.", "Bake at 350\u00b0 for 30 to 35 minutes."]
["peanut butter", "butter", "sugar", "brown sugar", "eggs", "flour", "baking powder", "salt", "semi-sweet chocolate chips", "vanilla"]