Set the oven to 230C fan/gas mark 8. Roughly chop the spring onions. ( cut them diagonally into 2cm lengths.) Chop the chilli similarly.
Put the basil leaves and the shellfish into a medium-sized baking dish. Break the eggs into the dish, then scatter the onion and chilli over the top. Trickle the oil over and season with salt and black pepper.
Bake for 10 minutes in the preheated oven until the eggs have just set. Scatter the nori flakes and toasted sesame seeds over.