In a large bowl, crack in the eggs and add the salt, pepper and milk and whisk.
Heat a little butter in a pan on a gentle heat and add the eggs. Gently cook, stiring constantly for a couple of minutes until the eggs are scrambled. Set aside.
Put the tortilla chips in an ovenproof dish and then top with the cooked eggs, half the salsa and cheese and put in the oven at 190°C for around 10 minutes until the cheese melts.
Meanwhile, put the avocado flesh in a bowl with the chipotle, lime juice and coriander and mash until desired consistency. Spoon on top of cooked nachos with the rest of the salsa and serve.