Trim crusts from bread and cut into cubes. Arrange bread cubes in bottom of greased 12x7 inch casserole dish.
Sprinkle shredded cheddar cheese evenly over bread cubes.
In large bowl, beat eggs until well combined. Add milk and mix thoroughly.
Stir salt, pepper, and dry mustard into egg mixture until dissolved.
Add crispy bacon and sausage to egg mixture, stirring until well blended.
Pour egg mixture over cheese and bread in casserole dish.
Cover tightly with foil and refrigerate overnight (at least 8 hours).
Remove from refrigerator 30 minutes before baking. Preheat oven to 350°F.
Bake covered for 50-55 minutes until center is set and top is golden brown.
Let stand 5 minutes before serving.