Preheat the oven to 350 degrees F.

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

Roll into 1-inch balls and place 1 inch apart on an un-greased baking sheet.

Flatten each dough ball with a fork, to create a criss-cross pattern.

Bake until the edges are firm, about 10 minutes. Cool on the baking sheet 5 minutes before removing to a wire rack to cool completely.