Veggie Egg Muffins

Bahan-bahan (12 porsi)

• 3 cups mixed vegetables (broccoli, mushrooms, peppers, spinach etc)
• 1 teaspoon olive oil
• 12 large eggs
• ¼ cup milk
• ½ teaspoon salt (or to taste)
• ½ teaspoon black pepper (or to taste)
• ½ teaspoon dry mustard powder
• 2 g reen onions (thinly sliced, or 3 tablespoons minced onion)
• 1 cup shredded cheddar cheese
• ¼ cup shredded Parmesan cheese