Preheat the oven to 325°F. Prepare a baking pan by lining with parchment or a silicone baking mat. Set aside.
In a medium bowl, whisk together flour, baking soda and salt.
In a small bowl, whisk together melted butter, sugar, egg yolks and vanilla extract until combined and smooth. Pour into dry mixture and mix until fully combined.
Add chocolate chips and mix well to distribute.
Using a 2 tablespoon cookie scoop, portion out dough balls and place about 2 to 2 ½ inches apart on the baking pan. Bake for 12-14 minutes or until they are puffed and the edges just begin to turn golden. (They bake for exactly 12 minutes in my oven for the perfect doneness.)
Remove from oven and allow to cool for about 5-8 minutes, or until they've firmed up a bit. Carefully remove from baking pan and place on a cooling rack.