If you’re using chocolate bars rather than féves, chop the chocolate bars until ¼-½ inch pieces and set aside.
Sift together the flour, salt, baking soda and baking powder. Set aside.
Using a standing mixer with a paddle attachment or a hand held mixer with a large bowl, cream the butter, granulated sugar, and brown sugar on medium speed for 4-5 minutes until fully combined and light and fluffy. Be sure to scrape down the sides fo the bowl as necessary.
Add the eggs, one a time, making sure to fully incorporate the each egg before adding the next. Then mix in the vanilla until combined.
Gently add the flour mixture and mix until just combined. Do not over mix the dough or it can get tough. You want mix only until combined.
Gently fold in the chocolate pieces using a spatula.
Line a baking sheet with parchment or a silicone baking mat and place about 3 ½ oz balls of dough (about the size of this cookie scoop) onto a baking sheet. At this point you can place them close together as you will not be baking them just yet.
Top with a sprinkle of sea salt, then cover with plastic wrap and place in the fridge for 24-36 hours.
When ready to bake, preheat the oven to 350 ℉.
Line a baking sheet with parchment or a silicone baking mat.
Place 6 balls of dough on the pan, leaving at least 2 inches around each cookies. Bake for 18-20 minutes until the edges are browned. Remove from oven, let cool, and enjoy!