Sauté chopped red pepper, asparagus and spinach with one tablespoon of oil for 5 minutes. Do not overcook. You still want the pepper and asparagus to be crunchy.
Whisk together eggs and milk in mixing bowl. Add salt and pepper and stir. Then add cheese and veggies, stir. Use a measuring cup to fill muffin pan with 1/2 cup of egg mixture.