Grease 13 x 9 inch pan.

20 slices of bread (buttered and cubed)
3/4 lb. grated American or Cheddar cheese

Layer alternately above ingredients. Then pour the following over dry ingredients.

2 1/2 c. milk
1/2 tsp. prepared mustard
2 tbsp. finely chopped onion
4 eggs (well beaten)
Salt and pepper

Allow to stand overnight, covered, in the refrigerator. Then bake 350 degrees for 55 to 60 minutes. May layer with sausage, bacon, or ham, or canadian bacon, cut in chunks.