Preheat oven to 350 degrees. Line two cookie sheets with parchment paper.
In a large mixing bowl, whisk together flour, baking soda and salt. Set aside.
Beat together butter, vanilla and sugars (medium speed for 2-3 minutes). Add the eggs one at a time, mixing in between additions.
Turn mixing speed to low, slowly beginning to add dry ingredients, ⅓ at a time. Beat until just combined (1-2 minutes).
Stir in the chocolate chunks.
Use a large cookie scoop (or a ¼ c. measuring cup) to form the cookies. Place scoops into a baking pan, place a few extra chocolate chunks on each dough ball. Cover and place into the fridge for 2-3 hours or even overnight.
When ready to bake, preheat oven to 350 degrees. Line two cookie sheets with parchment paper. While oven is preheating place chilled scoops onto prepared sheet, leaving at least 2 inches in between each cookie.
Place in oven and bake for 15-17 minutes, rotating the sheet half way through the baking process. Remove from oven when cookies are golden brown in color around the edges.
Right after cookies come out of the oven, sprinkle the tops of each with a little bit of the fleur de sel. Use the back of a metal spatula to round out the cookies or a round cookie cutter doing the swirl method.
Let cookies cool on pan for 3-4 minutes, then transfer to a wire rack to cool completely.