I just made one of these to stick in the oven in the morning for a sunday school breakfast. It is called a strata, a menonite recipe from a recipe book put together by local people north of Harrisburg, PA, at a place called Camp Hebron.
I make it several times a year for holiday breakfasts or church things. People always ask for the recipe, it is so good. The bread cubes in it makes it light and fluffy and the mustard gives it a taste that catches you by surprise, but it's a good surprise. ;)
6-9 slices of bread, cubed
1/2 to 3/4 pound of sausage, bacon or ham
1 c. shredded cheese
3 c. milk
1 tsp salt
1 1/2 tsp prepared mustard
Layer sausage, cheese and bread cubes in a greased 13 x 9 baking pan. Mix mustard with 1/4 c. milk and whisk to keep it from getting lumpy. Combine eggs, milk (including mixed in mustard), and salt with a whisk and pour over pan of layered food. Refrigerate overnight, then bake at 350 for 40 minutes.
You can also freeze this before baking and use at a later time.