Cheddar-Egg Casserole

6 Cups Cubed Cooked Ham
4 Cups Shredded Cheddar Cheese
8 Cups French Bread Cubes
3 Tablespoons Butter -- melted
1/2 Cup All-purpose Flour
1 Teaspoon Dry Mustard
8 Large Eggs
4 Cups Milk

Layer ham, cheese and bread cubes in a lightly greased 9 X 13" baking dish. Combine flour and mustard and sprinkle over top. Whisk together eggs, butter and milk; pour over casserole. Cover and refrigerate over night. Remove from refrigerator; let stand at room temperature 15 minutes. Bake, uncovered at 350° for 50 - 55 minutes or until set.