Preheat oven to 350 F. Line a baking sheet with parchment paper or a silpat and set aside. In a stand mixer, beat peanut butter, sugar, baking soda, and salt until combined. Add the egg and vanilla, and mix until fully incorporated. Stir in the chocolate chips.

Drop tablespoon-sized balls of dough onto prepared baking sheet and press down the top of the dough to flatten just slightly. Bake the cookies for 8 to 10 minutes or until slightly crinkled.

Do not let the edges brown.