Melt the chocolate and butter

• Melt half of the chocolate with the butter until smooth.
• Let it cool slightly.

Mix the wet ingredients

• Whisk the brown sugar into the melted chocolate mixture.
• Add the egg and vanilla and whisk until glossy.

Add the dry ingredients

• Sift in the flour, cocoa powder and salt.
• Fold gently until just combined, then stir in the chopped chocolate.

Prepare the pan

• Line a square pan with foil, leaving an overhang.
• Pour in the batter and spread it evenly.

Bake covered in the air fryer

• Bake at 180 °C with the foil covering the pan.

Bake uncovered

• Remove the foil and bake at 170 °C until the top is set and a skewer comes out fudgy.

Cool and slice

• Let the brownies cool completely in the pan.
• Lift out with the foil and cut into squares.