Cheesy Vegetable Egg Bake

Ingredients

• 2 tablespoons olive oil
• 4 ounces cremini mushrooms
• 1 cup broccoli florets
• 12 asparagus spears
• 1/2 red bell pepper
• 1/4 red onion
• 12 eggs
• 1/2 cup whole milk
• 1 teaspoon salt
• 1/4 teaspoon black pepper
• 4 ounces shredded mozzarella cheese
• 4 ounces shredded cheddar cheese
• 2 ounces grated Parmesan cheese