Freeze the Nutella: Line a small baking sheet with parchment paper. Drop 2-teaspoon mounds of Nutella onto it and freeze for at least 60 minutes, or until firm. Keep frozen until ready to stuff each cookie dough ball because Nutella thaws quickly!
1/2 cup Nutella
Preheat the oven: Preheat your oven to 350°F. Line two baking sheets with parchment paper.
Cream butter & sugars: In a stand mixer fitted with the paddle attachment, beat butter, brown sugar, and granulated sugar together on medium speed for 2–3 minutes until smooth and creamy.
1 cup unsalted butter, 1 cup dark brown sugar, 1/2 cup granulated sugar
Add wet ingredients: Mix in the egg, egg yolk, milk, and vanilla bean paste until well combined, scraping down the bowl as needed.
1 large egg + 1 yolk, 1 Tbsp. whole milk, 1 Tbsp. vanilla bean paste
Combine dry ingredients: In a separate bowl, whisk together flour, baking soda, and salt.
2⅔ cups all-purpose flour, 1 tsp. baking soda, 1/2 tsp. fine salt
Form the dough: Add the dry ingredients to the wet mixture and mix on low until just combined.
Add chocolate chips: Fold in chocolate chips by hand with a rubber spatula.
1½ cups chocolate chips
Stuff with Nutella: Scoop about 3 tablespoons of dough, flatten slightly in your hand, and place one frozen Nutella mound in the center. Wrap the dough around it, sealing completely so no Nutella is exposed. (And remember: Work in small batches about 6 cookies at a time and keep the rest of the Nutella in the freezer so it stays firm.) Bake: Place cookies on prepared sheets, spaced apart. Bake for 8-10 minutes, or until edges are golden and centers look slightly underbaked. Start Timer
Finishing touches: Immediately after baking, cookie-scoot into perfect circles using a round cutter or spoon, then top with a few extra chocolate chips and a sprinkle of flaky sea salt.
Flaky sea salt
Cool: Allow cookies to rest on the baking sheet for 5-10 minutes before transferring to a wire rack. Enjoy warm for that gooey Nutella center!