Storage: Cover leftovers tightly and refrigerate for up to 3 days. Reheat in the oven at 350°F until warmed through.
Variation: For extra heat, add more hot pepper sauce to the milk mixture or mix a little cayenne into the breadcrumb topping.
Tip: Use freshly grated cheese for the best melt and flavor; pre-shredded cheese often contains anti-caking agents that can make the sauce grainy.