All in One: Easy Egg Bread with Creamy Cheese Sauce!

Protein:
500 grams (1 pound) Italian sausage links, casings removed and crumbled
Vegetables:
1 medium onion, chopped
1 medium red bell pepper, chopped
1 cup chopped mushrooms
1 clove garlic, minced
Eggs:
8 large eggs
½ cup milk (whole milk or low-fat milk)
Salt and black pepper to taste
Cheese:
1 cup shredded mozzarella cheese
½ cup grated Parmesan cheese
Fresh Herbs (Optional):
Chopped fresh parsley or chives, for garnish
Instructions: