Preheat the oven to 350F (180C) and line a baking sheet with parchment paper.
Add the butter to a bowl, then add in both sugars and stir with a small spatula or a spoon to combine.
Once smooth, add the egg yolk and vanilla, and mix again to combine.
Add the flour, baking soda, and salt and mix until just combined.
Stir in the chocolate chips, then divide the dough into two balls and place on a baking sheet a few inches apart. Optionally, top each dough ball with a few chocolate chips.
Bake for 8-10 minutes until edges are light golden brown, but center is still soft.
Remove from the oven, top with flaky sea salt and cool. Enjoy!
Video
Notes
To air fry the cookies: Air fry at 325F (165C) for 5-7 minutes, then let cookies rest in the air fryer for a minute or two before removing.Recipe variations:
Deluxe - top the cookie dough balls with finely chopped pecans or walnuts and they'll get all toasty and delicious in the oven.
Brown butter cookies- If you want this to be even more delicious, you can brown your butter until nutty and fragrant and then use it in the recipe.
Kid friendly - add m&ms to the cookies by pressing on the dough balls before baking
One giant cookie- You can make just one massive dough ball to get an incredible giant single serving chocolate chip cookie. You'll bake for 14 minutes or so but keep an eye on the cookie.
Recipe tips:
Make sure your oven is preheated before baking the cookies. If you have an oven thermometer, those really come in handy.
Don't over bake the cookies. You want them just set in the center so they stay soft and chewy. The edges should be a light golden brown.
Don't overmix once you add your flour, so that you don't overdevelop the gluten and get tough cookies.