Of Course!  This Sausage and gravy Egg Casserole freezes beautifully. Two suggestions for freezing...  Make the breakfast casserole per recipe, serve and eat and then freeze leftovers in individual servings.  To reheat, remove from the packaging and cook on 50% power for about 4 minutes or until heated all the way through. Another option is to bake as directed in a freezer-safe dish.  Let cool completely, wrap well and freeze. Defrost in the fridge the night before planning to eat and then cook for 25 to 30 minutes at 350 until warmed through.