Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper or silicone baking mats.

In a large bowl, combine the peanut butter, granulated sugar, and egg.

Mix with a spatula until the dough is smooth and fully combined.

Scoop the dough into 24 equal portions, about 1 tablespoon each.

Roll each portion into a ball and place them 2 inches apart on the prepared baking sheets.

Use a fork to flatten each dough ball into a crosshatch pattern about 2 inches wide.

Bake for 5 minutes.

Rotate the baking sheets between racks and turn them front to back.

Continue baking for another 5–7 minutes until the cookies are lightly puffed and the edges are firm.

Let the Chewy 3-Ingredient Peanut Butter Cookies cool completely on the baking sheets for about 30 minutes before serving.