Preheat the oven to 190°C.
Slice the croissants in half and place them into a muffin tin or baking tray. Gently press the centres down to form cup shapes.
Spoon kimchi into the base of each croissant cup.
Add a layer of chopped ham over the kimchi.
Carefully crack one egg into each croissant cup, keeping it contained within the pastry.
Top generously with grated cheddar cheese.
Sprinkle over nori seaweed furikake for added umami flavour.
Bake for 18–20 minutes for a runny yolk, or 15–18 minutes at 200°C for a firmer yolk, until golden and set.