Use natural peanut butter without added sugar to control sweetness and achieve the best flavor. Don’t overbake the cookies; they should look slightly underbaked in the center when removed to keep them chewy. Chilling the dough for 30 minutes before baking can help prevent spreading. For nut-free or vegan options, substitute ingredients as suggested in the recipe. Store cookies in an airtight container at room temperature for up to 5 days or freeze for longer storage.