Preheat oven to 350°. In a large bowl, cream butter, peanut butter and sugars. Add eggs, 1 at a time, beating well after each addition. Beat in vanilla. Combine flour, baking powder and salt; gradually add to creamed mixture. Stir in chocolate chips.
Spread into a greased 13x9-in. baking pan. Bake 45-50 minutes or until a toothpick inserted in the center comes out clean. Cool on a wire rack. Cut into bars.
Every editorial product is independently selected, though we may be compensated or receive an affiliate commission if you buy something through our links. Ratings and prices are accurate and items are in stock as of time of publication.