The 6-Ingredient Breakfast Casserole I Make Every Christmas

Make ahead: The casserole can be assembled, covered with aluminum foil, and refrigerated for up to 24 hours before baking. Uncover before baking.

The casserole can also be frozen fully baked. Let cool, cover first with aluminum foil and then plastic wrap, and freeze for up to 2 months. Thaw overnight in the refrigerator and let sit at room temperature while heating the oven to 325ºF. Remove the plastic wrap and bake covered with aluminum foil until heated through, 50 to 60 minutes.

Storage: Leftovers can be refrigerated in an airtight container for up to 4 days. Reheat individual servings in the microwave until warmed through, 45 seconds to 1 minute.