"Butter both sides of the 16 slices of bread. Place 8 slices in a 8 x 10 pan which is 2" deep.Cover the bread with the sharp cheese and ham slices. Top this with the remaining 8 slices of bread. Mix the eggs, milk, mustard, and salt together. Pour over the casserole and refrigerate overnight. The next morning, combine 1/2 cup butter and the cornflakes, and put on top of the casserole. Bake for 1 hour at 350F. This is great when you have company!" Originally posted by Andrea Cassoni