Cream the butter and sugars

• In a bowl, cream together the butter, brown sugar and granulated sugar until combined.

Add the eggs and vanilla

• Add the eggs, egg yolks and vanilla, then mix until smooth.

Fold in the dry ingredients

• Add the flour, salt and baking soda.
• Gently fold in until just combined.

Fold in the chocolate

• Fold in the chocolate chips until evenly distributed, without overmixing.

Assemble the pie

• Press just over half of the dough into a circular pan.
• Spread the Nutella over the top.
• Cover the Nutella with the remaining dough, sealing the edges.
• Sprinkle extra chocolate chips on top.

Bake

• Bake at 170 °C until the edges are set and the centre is slightly soft and golden.

Cool and slice

• Let the pie cool completely before slicing.