In small bowl, combine flour, baking powder, baking soda, and salt. In large bowl, beat peanut butter and butter with an electric mixer until creamy. Add confectioners? sugar and brown sugar; beat until well combined. Gradually beat in vegetable oil, egg and vanilla; mix well. Add flour mixture and beat until just combined. Stir in chocolate chips, peanut butter chips and nuts. Drop dough by rounded tablespoons onto ungreased cookie pan, spacing 1-1/2 inches apart. Flatten slightly.