This is the ultimate crowd-pleasing breakfast casserole, perfect for feeding a group with minimal morning effort. It features a crispy hash brown base, savory sausage, peppers, and onions, all bound in a creamy, cheesy egg custard. Assemble it ahead for a stress-free brunch or holiday morning.
Thaw the hash browns overnight in the fridge or spread on a tray for 30 minutes to prevent a soggy casserole. The entire casserole can be assembled, covered, and refrigerated overnight before baking. Let it rest after baking for clean slices.