Preheat oven to 350°F. Line a large baking sheet with parchment paper.
In a medium bowl, stir together peanut butter and syrup with a spatula. At first your batter will be very liquidy, but as you continue to mix, the dough will thicken considerably. Stir until the dough has pulled away from the sides of the bowl and formed a dough ball.
Use a tablespoon to measure out 1 tbsp of dough. Roll between your hands and place onto prepared baking sheet. Repeat with remaining dough, spacing dough balls 2 inches apart.
Press down gently on dough balls with the palm of your hand to form round disks. If desired, use a fork to make criss-cross pattern.
Bake cookies for about 10 minutes, or until they are puffed up and the surface looks dry. Let cookies cool before attempting to remove them. If you remove them before they are set, they will crumble. Cookies should come off the parchment paper easily once they are set.
Notes
The texture is similar to shortbread in that it melts and crumbles in your mouth, though they are more delicate than classic shortbread.
I found the cookies are sturdier when they are thicker. If you aren't concerned about appearance, I recommend that you only gently press the dough balls down so they are dome-shaped, rather than making them round disks.
This recipe will only work with natural peanut butter (only peanuts in the ingredient list and no oils). Make sure to use a newer jar of peanut butter. If your peanut butter is no longer drippy, then it is too dry for this recipe to work. If you have any questions regarding substitutions for peanut butter, see the post for possible substitutions.
These cookies are not supposed to be super sweet. If you desire something sweeter, you can always dust them in powdered sugar free sweetener.
This recipe works best with ChocZero sugar free maple syrup.* I did try it with Lakanto maple syrup but the cookies barely had any sweetness and the cookies turned out drier and more crumbly. If you are not on a keto diet, this recipe also works with pure maple syrup. It does not work with honey.
*This product link is an affiliate link. This means I earn a small commission from qualifying purchases.
If you are on a keto diet, please remember to look at net carbs and not just total carbs. The net carbs count excludes fiber and sugar alcohols (carbs from erythritol).
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.