Start by preheating your oven to 350°F (175°C) and line a baking sheet with parchment paper for easy cookie removal.
In a large mixing bowl, combine the creamy peanut butter, brown sugar, and granulated sugar. Using a whisk or electric mixer, blend the mixture until it becomes smooth and creamy, ensuring the sugars are well incorporated.
Crack in the large egg and pour in the pure vanilla extract. Stir vigorously until the egg is fully integrated into the mixture, creating a uniform batter.
Sprinkle the baking soda and salt over the mixture, then combine thoroughly to activate the leavening agent.
Gradually sift in the gluten-free oat flour, folding it into the batter with a spatula or wooden spoon until a sticky dough forms. If you're a chocolate lover, gently mix in the semi-sweet chocolate chips at this point for added indulgence.
With a cookie scoop or tablespoon, portion out the dough and drop it onto the prepared baking sheet, ensuring there's ample space between each cookie to allow for spreading during baking.
Using the tines of a fork, gently press down on each dough ball to create a crisscross pattern, which not only adds flair but also helps the cookies cook evenly.
Bake the cookies in the preheated oven for 10-12 minutes, or until the edges are a delightful golden brown. The centers may still appear soft, which is perfectly normal.
Once baked, remove the cookies from the oven and allow them to cool on the baking sheet for about 5 minutes. After that, transfer them to a wire rack to cool completely, enhancing their chewy texture.
Notes
Pair with almond milk or tea for an enhanced experience.