Peanut butter cookies are a delicious treat, and, when they are homemade and fresh out of the oven, they taste even better. With this recipe, you're only four ingredients (1 cup of peanut butter, 1 cup of sugar, 1 egg, and 1 tsp. vanilla extract) and 35 minutes away from biting into warm, comforting peanut butter cookies. Plus, they don't contain any flour, so gluten-free holiday guests will also be able to enjoy. You won't be sorry you baked up a batch of these chewy peanut butter cookies (in fact, you make bake another!). Try adding in some chocolate chips for an extra treat.