Ingredients:

1 cup peanut butter (crunchy or creamy...your preference)
1 cup sugar
1 large egg

Directions:

Mix together all ingredients. Form into balls and place on cookie sheet. Use a fork to diagonally cross cookies each way. Bake at 350°F until golden.

For a variation, roll the dough balls in sugar, bake, and place a chocolate kiss in the center as you pull out of the oven.

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Source (credit): http://www.realsimple.com/food-recipes/recipe-collections-favorites/favorite-3-ingredient-recipes-00000000039797/page4.html

Picture Source (credit): http://www.cookingforengineers.com/recipe/58/Peanut-Butter-Cookies

PEANUT BUTTER COOKIES RECIPE