1-In a large skillet over medium heat,: In a large skillet over medium heat, add the butter and cook, stirring slowly with a whisk until golden, nutty scented and foamy, about 3-5 minutes. Set aside to cool.
2-Meanwhile, mix the flour, salt and baking: Meanwhile, mix the flour, salt and baking soda in a bowl.
3-Add the sugar and brown sugar to: Add the sugar and brown sugar to a standing mixer and add the browned butter. Mix for 2 minutes to properly combine the sugar mixture. Add the vanilla and mix again. Finally add the egg and egg yolk and mix for a few seconds or until the egg is incorporated. Add the flour bowl contents and mix for 30-60 seconds before adding the chocolate chips.
4-Place a large sheet of saran wrap: Place a large sheet of saran wrap on the counter and dump out the dough. Form the dough into a long log and cover tightly with saran wrap. Refrigerate the dough 30 minutes.
5-Slice the dough into circles to make: Slice the dough into circles to make it easier to flatten.
6-Meanwhile, heat the oven to 350 and: Meanwhile, heat the oven to 350 and line a few baking sheets with parchment paper or Silpat mats.
7-Press a ball of the dough in: Press a ball of the dough in the palm of your hand and place 1/2 teaspoon of nutella and 1/2 teaspoon of dulce de leche on the dough. Wrap the dough over the filling and shape into a ball. Place on baking sheets and bake for 9-10 minutes.
8-Remove from the oven and immediately sprinkle: Remove from the oven and immediately sprinkle with a little sea salt. Allow to cool for a minute or two before placing on a cooling rack.