In medium bowl with wire whisk beat soup until smooth Gradually blend in eggs 1 cup of cheese basil and pepper
In 10-inch oven-safe omelet pan or skillet over medium heat in hot margarine cook mushrooms and onion until mushrooms are tender and liquid is evaporated stirring occasionally
Pour mixture into skillet
Reduce heat to low
Cook 6 minutes or until edges are set 1-inch from edge
Do not stir
Remove from heat and serve For garnish use tomato wedges chopped fresh parsley or fresh basil leaves