Line a 9x9-inch baking tray with parchment paper. Place the butter and chopped chocolate in a microwave-safe bowl and microwave for 1 ½ minutes. Stir, then continue microwaving in 1-minute intervals until fully melted and smooth. Set the chocolate mixture aside.
¾ cup butter, 1 ¼ cups dark chocolate
In a large bowl, beat the eggs, egg yolks, and vanilla until fluffy. Add half the brown sugar and beat again. Add the rest of the sugar and continue beating until the mixture triples in volume.
3 eggs, 2 egg yolks, 2 teaspoons vanilla extract, ¾ cup brown sugar
Carefully pour the melted chocolate into the egg mixture, aiming along the sides of the bowl to keep the batter airy.
Sift together the flour, cocoa powder, and salt, and gently fold them into the batter until smooth and glossy.
2 tablespoons all-purpose flour, 1 tablespoon cocoa powder, ½ teaspoon salt
Add the chocolate chips and mix until they’re evenly distributed. Pour the batter into your prepared baking tray, and sprinkle a few extra chocolate chips on top if you’d like.
½ cup dark chocolate chips
Place the pan in the air fryer basket and bake at 325°F (160°C) for 15 minutes. Let the brownies cool completely in the pan.
Once cooled, remove from the pan, cut into squares, and sprinkle with a pinch of sea salt flakes for an extra flavor boost.
Sea salt flakes