Preheat oven to 350. Lightly grease a 9 X 13 X 2 inch baking pan. Blend together peanut butter, butter, brown sugar, and white sugar until creamy. Gradually beat in eggs and vanilla. Mix flour, baking powder and salt together, then add to creamed mixture. Spread into prepared baking pan. Sprinkle chocolate chips on top. Bake for 5 minutes. Remove from oven and run knife through batter to marble the chocolate chips. Return to oven for 15 minutes. Cool completely before cutting into bars.
|