Preheat the oven to 350°F.
In a bowl, mix together the peanut butter, sugar, and egg until well combined.
Scoop out small portions of the dough and roll them into balls.
Place the dough balls onto a baking sheet lined with parchment paper.
Using a fork, make a crisscross pattern on each cookie.
Bake in the preheated oven for 10-12 minutes, or until the edges are slightly golden.
Remove from the oven and let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.
