Preheat oven to 350.Line baking sheets with parchment paper.In a large mixing bowl, cream together the peanut butter, butter. Once combined beat in the white sugar, and brown sugar until well blended. Beat in the egg, milk, and vanilla.In a large bowl whisk together the flour, baking powder, and salt. Gently add to creamed mixture and mix until almost combined. Fold in chocolate and peanut butter chips. Chill dough for at least 15 minutes.