On a wax paper or parchment lined baking sheet, dollop nutella in about 2 teaspoon amounts. You can also put the Nutella into a piping bag and pipe the centers. You will need 16 Nutella centers. I like to take a wet finger and smooth the tops of the centers. Place in the freezer for one hour while you make the cookie dough. ¾ cup (210 g) Nutella
In a large bowl, whisk the flour, baking soda, cornstarch, and salt together. Set aside. 2 ¼ cups (280 g) all-purpose flour 1 teaspoon baking soda 2 teaspoons cornstarch ½ teaspoon salt
In a medium bowl, whisk the melted butter, brown sugar, and granulated sugar together until smooth and combined. ¾ cup (170 g, 1 ½ sticks) unsalted butter ¾ cup (150 g) packed light brown sugar ½ cup (100 g) granulated sugar
Whisk in the egg and egg yolk until evenly mixed in. Whisk in the vanilla extract until evenly incorporated. 1 large egg 1 egg yolk 2 teaspoons pure vanilla extract
With a spatula or wooden spoon, stir in the flour mixture and chocolate chips. Let the dough sit for 10 minutes to thicken up before scooping. 1 ½ cups (255 g) semi-sweet chocolate chips
Scoop the cookie dough in 3 Tablespoon amounts (about 60 g). Flatten each cookie dough ball and place a Nutella center in the middle of the cookie dough. Fold the cookie dough around the Nutella center. Place the cookie dough balls on a wax paper or parchment lined baking sheet. Cover and refrigerate for at least 2 hours.
When ready to bake, preheat oven to 350°F (180°C). Line large baking sheets with parchment paper or silicone baking mat.
Place cookie dough balls spaced a few inches apart. Bake only six at a time as the cookies are large. Keep others refrigerated and covered while each batch is baking.
Bake the cookies for 12-14 minutes or until the edges are very lightly browned. The centers will look soft but will continue to set up. Cool on the baking sheet for 10 minutes. After 10 minutes of cooling on the baking sheets, transfer cookies to a wire rack to cool completely. Cookies stay fresh covered at room temperature for up to 1 week.