1 - Preheat oven to 350ºF (180ºC).

2 - In a large bowl, mix together the peanut butter, sugar, and egg.

3 - Scoop out a spoonful of dough and roll it into a ball.

4 - Place the cookie balls onto a nonstick baking sheet.

5 - For extra decoration and to make them cook more evenly, flatten the cookie balls by pressing a fork down on top of them, then press it down again at a 90º angle to make a criss-cross pattern.