Melt butter in a skillet. Sauté onions and mushrooms until tender; set aside. Spread hashbrowns in a greased 13"x9" baking pan. Sprinkle with salt, pepper and garlic salt; top with bacon, onions and mushrooms. Whisk together eggs with milk and parsley; pour over casserole and top with cheese. Cover and refrigerate overnight. Bake, uncovered, at 400 degrees for one hour, or until set.
This Make-Ahead Brunch Casserole recipe is from the 101 Homestyle Favorites Cookbook. Download this Cookbook today.