Preheat the oven to 350°F and line a baking sheet with parchment paper.
Add all the ingredients to a medium mixing bowl and mix to combine using a spatula or hand mixer.
Using a Tablespoon scoop the dough and roll into balls placing 2-inches apart on the baking sheet.
Flatten each dough ball with a fork, making a crisscross pattern.
Bake for 9-12 minutes, or until the cookies are slightly golden brown around the edges and the bottom.
Remove and immediately sprinkle with flaked sea salt, if using. Let cookies cool and few minutes on the baking sheet then transfer to a cooling rack to cool completely
Notes
Peanut-free: If you have a peanut allergy or just aren't a fan you could use almond butter or cashew butter instead. Just note that the cookies could result with a different texture depending on the consistency of the nut butter you use.
Storage: Keep these cookies in an airtight container at room temperature for up to a week. For longer storage, freeze them in a freezer-safe container with parchment paper for up to 3 months. If they lose their crispness, reheat in a 300°F oven for 5-10 minutes.