1. In shallow 8- or 9-inch round microwave dish, cook onions and margarine, covered, on high power 2 minutes. Stir in chilies and tomato; cook, uncovered, 1 minute. 2. In medium size bowl, beat together eggs, egg whites, milk, garlic powder and Sweet’N Low; pour over vegetables. Continue cooking, uncovered, 4 to 5 minutes, stirring frequently to move mixture from outside of dish toward center. 3. Just before eggs are firm, sprinkle with cheese. Do not overcook, as mixture will continue to cook after being removed from microwave. 4. Sprinkle with green onion and parsley. Serve immediately.