Add the ingredients and mix, line the pan with parchment paper, air fry at 180°C (356°F) for 10 minutes, leave in the freezer for 30 minutes before eating → 72g
Preheat the oven to 180°C (356°F)
Melt butter and dark chocolate together in a double boiler
In a bowl, combine the melted butter, chocolate, and sugar
Add the egg and mix well
Sift in the flour and cocoa powder, and gently fold together
Pour the batter into a parchment-lined pan
Bake for 25~30 minutes
Let cool and slice into bite-sized pieces