Preheat your oven to 350°F (175°C).

Line a baking sheet with parchment paper or a silicone baking mat.

In a medium mixing bowl, combine the sugar, peanut butter, and egg.

Stir until the mixture is fully incorporated and forms a dough.

Roll the dough into 1-inch balls.

Place the dough balls onto the prepared baking sheet, leaving space between each cookie.

Using the back of a fork, gently press down on each cookie to create a criss-cross pattern.

Bake for 12 minutes.

Remove from the oven and allow the cookies to cool on the baking sheet for 1–2 minutes.

Transfer to a wire rack to cool completely.

Serve and enjoy.