Preheat your oven to 350 degrees
Place 3/4 cup of butter into a microwave safe bowl and heat for 30 seconds or until the butter is partially melted
Add 3/4 cup of granulated sugar and 3/4 cup of brown sugar to the partially melted butter and whisk vigorously until creamy and fully combined
Add 2 teaspoons of vanilla extract and 3 egg yolks and whisk to combine
Add 2 cups of all purpose flour, 1/2 teaspoon of baking soda and 1/2 teaspoon of salt and mix until just combined
Add most of the roughly chopped dark chocolate and gently fold to evenly distribute
Add 1 tablespoon portions of cookie dough onto parchment lined baking sheets about 2 inches apart
Press bits of the remaining chopped chocolate over each portion of dough
Bake in a 350 degree oven for 10-12 minutes or until the edges are lightly golden
Transfer the baking sheets onto cooling racks, sprinkle the cookies lightly with flaky sea salt and allow the cookies to cool for a few minutes before directly transferring them onto the cooling rack
Store leftover cookies in an airtight container