Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large mixing bowl, combine the peanut butter, granulated sugar, egg, baking soda, vanilla extract, and salt.
Mix the ingredients together until a smooth dough forms.
Using a tablespoon, scoop out dough and roll into balls, placing them about 2 inches apart on the prepared baking sheet.
Flatten each ball gently with a fork, creating a crisscross pattern on top.
Bake in the preheated oven for 10 to 12 minutes, or until the edges are lightly golden.
Remove from the oven and allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.