Preheat oven to 350F. Line baking sheet with parchment paper or silicone baking mat.
In a large mixing bowl, combine peanut butter, brown sugar, egg, baking soda and vanilla extract. Stir in chocolate chips.
Use a cookie scoop (about 1 tablespoon) and drop onto prepared baking sheet. Bake for 10 – 12 minutes. Transfer to wire rack to cool or enjoy warm.