Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C).

Mix peanut butter, sugar, and egg together in a bowl using an electric mixer until smooth and creamy.

Roll dough into 1-inch balls and place 2 inches apart on ungreased baking sheets.

Flatten each with a fork, making a criss-cross pattern. Bake in the preheated oven until edges are firm, about 10 minutes. Cool on the baking sheet briefly before removing to a wire rack to cool completely.

Enjoy!