Preheat the oven

• Preheat the oven to 180 °C.

Make the cookie dough

• Beat the softened butter with the brown sugar and granulated sugar until creamy.
• Beat in the egg and vanilla extract.
• Fold in the flour, baking soda and salt, then stir in the chocolate chips.

Assemble the pie

• Press half of the cookie dough into the bottom of the pie dish.
• Spread the Nutella over the dough, leaving a small border.
• Cover with the remaining cookie dough and press the edges to seal.

Bake

• Bake until the top is golden and the centre is just set.

Cool and serve

• Let the pie cool in the dish so the Nutella sets slightly, then slice and serve.