Preheat the oven to 375. combine the flour, baking soda, and salt. In a larger bowl, combine the butter, sugar, brown sugar, and vanilla and mix until smooth. Add the eggs one at a time, mixing well in between each.
Gradually add in flour mixture, then add chocolate chips. Mix until it just comes together. Using a medium cookie scoop, scoop 12 cookies to a baking sheet. Bake them for 8-11 minutes, until golden brown. While they cool, make the mousse.
To make the mousse, combine the cream cheese and Nutella in a stand mixer until smooth. Add the heavy cream and mix for a few minutes until stiff peaks form.
Once the cookies are cool, begin to layer! Start with a layer of cookies, about 6-8. Then add a large scoop of mousse, about 1 cup. Repeat this process, adding less cookies and mousse as it goes up, to create a mounded look. Put the finished creation in the fridge to set up for at least 3 hours or overnight! Enjoy!
