Nutella-Stuffed + Sea Salt Chocolate Chip Cookies (simplesmente animal)

Ingredients

2 1/4 cup flour
1 1/4 teaspoons baking soda (5g)
1/4 teaspoon of salt (2g)
2 sticks (1 cup) unsalted butter (225 g)
1 1/4 cup packed dark brown sugar
1/4 cup granulated sugar
1 large egg plus 1 egg yolk
1 tablespoon plain greek yogurt
3/4 cup semi-sweet chocolate chips
1/2 cup milk chocolate chips
1/2 cup dark chocolate chips
1 jar of Nutella, chilled in refrigerator
sea salt for sprinkling

Instructions

1. Whisk together the flour, baking soda, and salt in a bowl and set aside. 
2. Melt butter in sauce pan or microwave and let cool. With an electric mixer, mix the butter and sugars until thoroughly blended. Beat in the egg, yolk and yogurt until combined. Add the dry ingredients slowly and beat on low-speed just until combined. Gently fold in all of the chocolate chips.
3. Chill your dough for 2 hours in the refrigerator.
4. Preheat the oven to 200 degrees C. Once dough is chilled measure about 1 tablespoon of dough and roll into a ball. Flatten the dough ball very thinly into the palm of your hand. Place 1 teaspoon of chilled nutella in the middle and fold dough around it; gently roll into a ball — it doesn’t have to be perfectly rolled! Make sure that the nutella is not seeping out of the dough. Add more dough if necessary. Place dough balls on cookie sheet, 2 inches apart and flatten with your hand VERY gently. (Really only the tops need to be flattened a bit!)
5. Bake the cookies 9-11 minutes or until the edges of the cookies begin to turn golden brown. They will look a bit underdone in the middle, but will continue to cook once out of the oven. 

Original recipe (I slightly modified a couple of things) from: http://www.ambitiouskitchen.com/2012/09/nutella-stuffed-brown-butter-sea-salt-chocolate-chip-cookies-my-favorite-cookie-ever/