Prepare Mac n Cheese according to directions. Stop before step 3. Crumble Chorizo in skillet and cook 7 minutes on medium heat. Tilt pan to drain grease off meat. Combine Macaroni, cheese sauce, and chorizo in loaf pan. Sprinkle with shredded cheese and bread crumb topping. Bake at 425 degrees for 8 minutes. Serve hot!