Butter a 9 by 13-inch pan and place the bread cubes in the bottom. Beat the 8 eggs, then add the milk, thoroughly mix together. Add the salt and dry mustard to the egg mixture. Now, pour this egg mixture over the bread cubes in the pan. Place the cubes of Velveeta cheese over this bread and egg mixture. Cover with plastic wrap and place in the refrigerator overnight.

Cook the sausage and bacon separately and drain the grease. When cooled, place in the refrigerator until the next morning. Remove the plastic wrap the following morning. Preheat the oven to 325 degrees. Take the cooked sausage and bacon and press down into the casserole. Sprinkle the grated cheese on top. Bake uncovered for 1-1/2 hours or until eggs are set.