Melt the butter and chocolate

• Place the butter and chocolate in a saucepan over low heat.
• Stir until completely smooth, then remove from the heat.

Mix the wet ingredients

• Stir the sugar into the melted chocolate mixture.
• Add the eggs and vanilla and whisk until smooth.

Fold in the dry ingredients

• Add the flour, cocoa powder and salt and fold until just combined.
• Fold in the chocolate chunks.

Layer the batter with Nutella

• Pour half of the brownie batter into a lined baking pan and spread evenly.
• Add spoonfuls of Nutella over the batter.
• Cover with the remaining brownie batter and top with extra chocolate chunks.

Bake

• Bake at 175 °C until the top is crackly and the center stays fudgy.
• Let cool in the pan before slicing.