The Border Cookbook's Joe's Breakfast Nachos

So this is just migas, really, and I have posted at least one great recipe for migas here, but if it's possible, this one was even easier, and still tasted delicious, so I wanted to feature it.  This received a 9 from all of us.  Each serving was 620 calories, but they were large, and very filling.  Here's what I did:

1/2 lb chorizo
1 onion, chopped
1 T butter
salt to tast
3 eggs
1 T water
2 oz salted tortilla chips
8 oz grated cheese
1 small tomato, chopped

Preheat oven to 350.
Saute the chorizo over medium heat.  Remove the chorizo, and add the onion.  Cook until softened.  Place the butter in an 8x8 baking dish, and melt it in the oven.  Mix the eggs and water together, then add the chorizo and eggs to the pan with the onions.  Cook for a minute or two, then spread the egg mixture in the warmed baking dish.  Top the eggs with the tortilla chips.  Sprinkle with the cheese.  Cook for 5-8 minutes, then top with the tomato and serve immediately.