Combine Dry Ingredients: In a small mixing bowl, add the flour, baking soda, and salt. Whisk until well combined.
Cream Butter and Sugars: In a large mixing bowl, add softened butter and both sugars. Beat on high for 2 minutes until well combined, pale, and fluffy. Scrape down the sides.
Incorporate Egg and Vanilla: Add the egg and vanilla, beating for 15 seconds until well combined.
Mix in Oats: Pour in oats and beat on low speed for 10 seconds until just incorporated into the dough.
Add Flour Mixture: Add the dry flour mixture, beating for on low speed for 15 seconds until a dough forms without over-mixing.
Chocolate Chips: Fold in chocolate chips using a spatula until evenly distributed.
Chill: Cover and chill the dough in the fridge for 30 minutes.
Preheat Oven: While the dough chills, preheat the oven to 180ºC (356ºF) and line a baking sheet with parchment paper.
Form Cookies: Roll about 1 heaping tablespoon (300g/1 oz.) of dough into a ball, flatten in your palms and place on the baking sheet. Leave a small gap between each cookie.
Bake: Bake for 12-14 minutes until the edges are golden and the tops are set.
Cool: Allow to cool on the tray for 5 minutes, then transfer to a wire rack. Enjoy!