Melt butter in a saucepan over medium heat until brown bits form on the bottom and it gives off a nutty aroma.
Preheat oven to 350 Fahrenheit
Sift the flour, baking soda, and the salt together.
In a mixer, mix the butter and sugars until fully combined.
Add the egg, yolk, vanilla, and the Greek yoghurt.
Add the dry ingredients slowly until fully incorporated
Add your chocolate chips!
Place on a sheet with parchment paper and push some sea salt onto the top. Bake for exactly 10 minutes.
Cool and enjoy!