Mix butter, peanut butter, sugars and egg throughly.
Mix flour,baking powder, baking soda, and salt together. Mix the dry ingredients into the Peanut mixture; mix throughtly. Chill for one hour or longer.
Heat oven to 375. Roll into balls the size of large walnuts. Place 3" apart on lightly greased cookie sheet. Flatten with fork dipped in flour..crisscross.
Bake 10 to 12 minutes. Makes about 3 dozen or 3 1/2 dozen cookies
Not a NESTLÉ®-tested recipe.