Set oven to 350°F (175°C) and line a baking sheet.
Combine peanut butter, sugar, and egg in a bowl until smooth.
Roll dough into 1-inch balls and place on the sheet.
Press each cookie with a fork to make a crisscross pattern.
Bake for 10 minutes or until edges are firm.
Cool on sheet for 5 minutes, then transfer to a rack and enjoy.
