Preheat oven to 350°F (175°C)
Line baking sheets with parchment paper
In a bowl, mix 1 cup (250 g) peanut butter with 1 cup (200 g) granulated sugar
Add 1 large egg and mix until smooth
Stir in 1/2 tsp vanilla extract
Stir in 1/2 tsp baking soda (optional for extra lift)
If dough is too sticky, chill 10–20 minutes
Scoop tablespoon-sized balls and place 2 inches apart on the baking sheet
Press each ball with a fork in a crisscross pattern
Bake 8–10 minutes, until edges look set
Cool on the baking sheet for 5 minutes
Transfer to a wire rack to cool completely