Christmas Morning Breakfast Casserole

Ingredients (16)

• 2 tbsp olive oil
• 1 lb ground breakfast sausage
• 1 medium red onion
• 1 red bell pepper
• 1 green bell pepper
• 1/2 lb crimini mushrooms
• 1 tsp salt
• 1 tsp black pepper
• 8 large eggs
• 2 cups heavy cream
• 1 cup water
• 1/4 cup maple syrup
• 8 cups day-old challah
• 6 oz ham
• 1/2 cup finely chopped green onions
• 2 cups shredded Monterey Jack cheese