Breakfast Casserole

Bahan-bahan (12 porsi)

• 1 pound ground breakfast sausage or pork sausage*
• 1 tablespoon olive oil
• 1 small yellow onion, chopped
• 4 cloves garlic, minced
• 2 medium bell peppers, chopped (I used one red, one yellow)
• 8 ounces baby bella mushrooms, sliced
• 1 large handful fresh baby spinach
• 1 pound shredded or diced hash browns, thawed
• 1 tablespoon Old Bay seasoning
• 12 large eggs
• 1/4 teaspoon freshly-ground black pepper
• 1/2 cup half-and-half
• 2 cups (8 ounces) shredded sharp cheddar cheese
• optional garnishes: avocado slices, chopped green onions