Asparagus Frittata

Ingredients

• 1 cup water
• 2/3 pound fresh asparagus, trimmed and cut into 1-inch pieces
• 1 medium onion, chopped
• 2 teaspoons olive oil or canola oil
• 2 tablespoons minced fresh parsley
• 1 1/2 cups egg substitute
• 5 tablespoons shredded Parmesan cheese, divided
• 1/4 teaspoon salt
• 1/8 teaspoon pepper
• 1/4 cup shredded reduced-fat cheddar cheese