Preheat the oven to 350°F (180°C). Spray a 9x13 pan with non-stick spray and set aside.
In the bowl of a stand mixer or with an electric hand mixer, cream together the butter, brown sugar, and granulated sugar until light in color and fluffy in texture.
1 cup (167g) salted butter, softened, 1 cup (246g) brown sugar, 1/2 cup (115g) granulated sugar
Scrape the sides and add in the egg and vanilla. Mix until well combined.
1 egg, 1 tsp vanilla
Next, you will add the flour, baking soda, and salt. Mix until a soft dough forms.
2 1/4 cups (342g) all-purpose flour, 1 tsp baking soda, 1/2 tsp salt
Once a soft dough has formed, press half of the dough into the bottom of the prepared pan.
Now, spread the Nutella onto the top of the cookie dough in the pan.
1 (13 oz jar) nutella
Crumble and press the remaining cookie dough onto the top of the Nutella layer.
Sprinkle the top with flakey sea salt.
flakey sea salt
Bake at 350°F (180°C) for 15-17 minutes. The edges should begin to turn brown but the entire top shouldn’t.
Allow the bars to cool completely before cutting and serving. Enjoy!