Preheat oven to 350 degrees F and prepare a cookie sheet by lining it with parchment paper or a baking mat.

In a large bowl mix the peanut butter, sweetener, egg, vanilla extract until well combined. (If it's very dry, you may add 1 tablespoon of milk)

Using a cookie scooper, scoop the cookies on the baking mat and then using a fork, press down on each of the cookie dough balls to create the crisscross pattern of the classic peanut butter cookies.

Bake for 11-13 minutes and allow the cookies to cool for about 3-4 minutes (if you don't allow the cookies to cool, it will fall apart) and then transfer over to a cookie rack to finish cooling.