Brown the butter

• Melt the butter in a saucepan over medium heat until golden and nutty.
• Remove from the heat and let it cool slightly.

Make the cookie dough

• Whisk the browned butter, brown sugar and granulated sugar until glossy.
• Add the egg, heavy cream and vanilla and whisk until smooth.
• Fold in the flour, baking soda and salt until just combined, then fold in the chocolate chips.

Assemble the pie

• Line a round cake pan or pie dish with parchment paper.
• Press a little over half of the dough into the bottom and slightly up the sides.
• Spread a thick layer of Nutella in the center, cover with the remaining dough and scatter extra chocolate chips on top.

Bake

• Bake at 175 °C until the edges are golden and the center is still slightly soft.

Cool and serve

• Let the pie cool a bit before slicing so the Nutella stays gooey.