Cream butter, peanut butter, and sugars together in a bowl; beat in eggs.

In a separate bowl,sift flour,baking powder,baking soda and salt.Stir into butter mixture

Put dough in refrigerator for 1 hr

Roll dough into balls and put on baking sheets

Flatten each ball with a fork making,a crisscross pattern.

Bake in a preheated oven to 170°-180° for about10 minutes or untill cookies begin brown.