Gather the ingredients. Preheat the oven to 400 F (200 C/Gas 6).
In a mixing bowl with an electric mixer, or in a stand mixer, cream the white and brown sugars with the butter and crunchy peanut butter until light and fluffy.
Beat the egg and vanilla into peanut butter mixture until smooth and well blended.
In a separate bowl, combine the flour, salt, and baking soda.
Blend flour mixture into creamed ingredients gradually.
Using lightly floured hands, shape the peanut butter cookie dough into 1-inch balls and place 2 inches apart on parchment-paper-lined (or ungreased) cookie sheets.
Dip a fork in flour and press it into the balls of dough, making a criss-cross design and flattening the cookies slightly. Dip the fork in the flour after each press. Dust each cookie with additional granulated sugar, if desired.
Bake in the preheated oven for about 7 minutes, or until the cookies are lightly browned around edges.