st. patrick's brunch casserole

Ingredients For st. patrick's brunch casserole

• 1 lb

  bulk pork sausage
• 1/2 lb

  sliced mushrooms
• 1 lg

  onion, chopped
• 10

  eggs
• 3 c

  milk
• 2 tsp

  mustard, ground
• 1 tsp

  salt
• 1/2 tsp

  pepper
• 6 c

  cubed day old bread, white, whole wheat, or mixed
• 1 c

  chopped seeded tomatoes
• 1 c

  pepper jack cheese, shredded
• 1 c

  cheddar cheese, shredded