Preheat your oven to 350°F (175°C).

Line a baking sheet with parchment paper.

In a mixing bowl, combine peanut butter, brown sugar, and granulated sugar.

Beat in the egg and vanilla extract until smooth.

Add baking soda and salt, mixing thoroughly.

Fold in the rolled oats until evenly mixed.

Using a cookie scoop or tablespoon, drop rounded portions of dough onto the prepared baking sheet.

Bake for 10-12 minutes, or until the edges are lightly golden.

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