Preheat oven to 350°F (175°C).

Mix peanut butter, brown sugar, and white sugar in a medium bowl until smooth. Work through mixture, pressing the batter against the bowl with the back of the spoon to remove air bubbles and thoroughly combine ingredients.

Add remaining ingredients and mix well.*

Form into 1.5 inch balls and place on cookie sheet. Flatten with fork, creating a crosshatch pattern.

Bake for 10 minutes on middle rack, turning pan halfway through. Remove from oven and let cool on pan for 5-10 minutes, then move to cooling rack.