Bake the mac & cheese according to the package instructions.
While mac & cheese is baking, remove the casing from the chorizos. Cut into1 inch pieces and place them in a food processor.
Pulse 2 or 3 times until chorizo is finely chopped.
Mix the mac & cheese with the chorizo and transfer into a casserole dish.
Sprinkle the shredded cheese on top of the mac & cheese.
Spread the breadcrumbs on top of the cheese.
Drizzle melted butter over the top.
Bake for 20-25 minutes until it lightly browns on the top and the edges start to bubble a bit.
For a milder version, leave out the chili.