Mix everything together and bake in the air fryer at 180°C for 20 minutes.
Combine flour, baking powder, cocoa powder, and salt in a bowl.
Add cold butter and cut it into the mixture until evenly incorporated.
Add sugar, chocolate chips, finely chopped yuzu marmalade, and milk. Mix quickly.
Gather the dough together, shape into a thick round, and cut into triangles.
Place parchment paper on a baking pan and set the dough pieces on top.
Bake in a 180°C oven for 20–25 minutes.
Let cool on a wire rack.