In a medium bowl, whisk together the egg substitute, eggs, and milk. Stir in the scallions, thyme, parsley, pepper, and salt.
Place the asparagus and 1/4 cup of water in a large microwaveable bowl. Cover with vented plastic wrap and microwave on high power for 4 minutes, or until crisp-tender. Stop and stir after 2 minutes. Drain, pat dry, and add to the egg mixture.
Heat a medium nonstick skillet coated with cooking spray over medium heat. Pour one-quarter of the egg mixture into the skillet, allowing it to cover the bottom of the pan. Cook for 2 to 3 minutes, or until the bottom just begins to set. Sprinkle with 1 tablespoon of the cheese. Add one-quarter of the asparagus pieces. Cook for 5 minutes, or until the eggs are almost set.
Using a large spatula, fold the omelet in half. Cook for 3 minutes, or until the omelet is golden and the cheese is melted. Turn onto a plate and keep warm.
Coat the skillet with cooking spray and repeat the process with the remaining ingredients to make 3 more omelets. Garnish with the chives.
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