What will we need to make delicious peanut butter cookies? First we need to make a peanut butter mixture out of butter, peanut butter, white sugar, brown sugar, egg. Then a flour mixture that is includes flour, salt, baking powder, baking soda. Mix the two mixtures together and put it in the freezer for an hour. Then you need to roll it into balls and flatten each ball using spoon. Bake it in oven! Serve the cookies in a plate.