Preheat your oven to 350°F (175°C).

Line a baking sheet with parchment paper.

In a mixing bowl, combine the peanut butter and sugar.

Crack the egg into the mixture and add the vanilla extract.

Stir in the baking soda until fully combined.

Using a tablespoon, scoop out the dough and place it onto the prepared baking sheet.

Use a fork to press down gently on each cookie, creating a crisscross pattern.

Bake the cookies in the preheated oven for about 10 minutes or until golden brown.

Allow them to cool on the baking sheet for a few minutes before transferring them to a wire rack.