Melt butter and chocolate for the brownie

• Melt the butter and milk chocolate together in a saucepan.
• Set aside to cool slightly.

Whisk eggs and sugar

• In a bowl, add the eggs and granulated sugar.
• Whisk until light and frothy.

Finish the brownie batter

• Mix the melted chocolate and butter into the eggs.
• Add the vanilla.
• Gently mix in the flour and cocoa powder until smooth.

Make the cookie dough

• Melt the butter and mix with the brown sugar, granulated sugar and salt.
• Mix in the egg and vanilla.
• Mix in the flour and baking powder until just combined, without overmixing, then fold in the chocolate chips.

Prepare the tin and oven

• Line and grease a baking tray.
• Heat the oven to 180 °C.

Assemble and bake

• Spread the brownie and cookie mixtures into the tin however you like.
• Bake until set with a fudgy centre.