Supper Strata
["8 slices bread", "4 eggs", "1 1/2 c. milk", "2 Tbsp. onion", "8 to 12 slices cheese", "1/4 tsp. ground mustard"]
["Mix all ingredients except cheese and bread.", "Place 4 slices of bread in pan.", "Place cheese on bread slices and cover with 1/2 of mixture.", "Place remaining bread on others and top with remaining cheese.", "Cover with rest of mixture.", "Cover and let stand for 1 hour or overnight.", "Bake at 350\u00b0 for 1 hour.", "Let rest for 10 minutes before serving."]
["bread", "eggs", "milk", "onion", "cheese", "ground mustard"]