Combine first 5 ingredients; stir well with a whisk. Stir in noodles and spinach.
Melt margarine in a 10-inch ovenproof skillet coated with cooking spray over medium heat. Add garlic; sauté 1 minute. Spread egg mixture in skillet. Cover; reduce heat to low. Cook 6 minutes or until top is almost set. Uncover; sprinkle with cheese. Preheat broiler. Broil 5 minutes. Serve immediately.