Make the night before:

6 slices bread
3 lg. ham slices, cubed
1/2 lb. Cheddar cheese, grated
1 tsp. salt
1 can cream of mushroom soup
8 eggs, beaten
3/4 tsp. dry mustard
2 1/2 c. milk

In a greased 9 x 13 inch pan, arrange ham, grated cheese, soup, eggs, mustard, salt and milk. Cube bread slices and push down into above mixture. Melt 1/4 cup butter and drizzle over. Cover and refrigerate several hours or overnight. Bake uncovered at 325 degrees for 40 to 60 minutes. Let firm up a little before serving.