Preheat oven to 350°F (177°C). Line a large cookie sheet with parchment paper or a silicone baking mat.

Add peanut butter to a large mixing bowl. Sift in the allulose with a small strainer. I recommend sifting it in because it makes it much easier to mix it in. While most of the allulose should easily sift in, you may be left with a few bigger clumps. Use your fingers to break down those clumps by pressing and moving them inside the strainer. If you are left with a few tiny hard lumps that won't break up any further, you can just leave those out. Stir the allulose into the peanut butter until it is completely incorporated and thickens the peanut butter.

Add in cocoa powder. Stir it in until your mixture is uniform in color. Your mixture should also be thick, like cookie dough. You can taste the dough at this point and if you wish for more sweetness you can add another 1 tbsp of allulose. If you want more chocolate flavor you can add another ½ tbsp of cocoa powder.

Using a 2 tsp cookie scoop to scoop the dough. Roll dough between palms until it becomes a round ball. Place onto cookie sheet, spaced 1 inch apart. Repeat with remaining dough. If you don't have a 2 tsp cookie scoop, you can just use a regular teaspoon to measure out 2 tsp of dough per cookie.

Place cookies in the oven and bake for about 10 minutes. Be very careful not to bake too long because the cookies overcook very fast and will taste burnt if overcooked. It is a little tricky to tell when these cookies are cooked because they will still look wet on top (this is because of the allulose). You don't want to wait for the tops of the cookies to be dry. Only the bottom sides (about ⅓ up from the bottom of the cookie) of the cookies should look dry and cooked. Let cookies cool completely and set before removing them from the cookie sheet. If desired, dust with more allulose before serving.