1Coarsely chop spinach. In 2-quart saucepan, place spinach and water. Cover and cook over medium-low heat 3 to 5 minutes or until wilted.
2Meanwhile, in medium bowl, mix eggs, egg whites, onions, milk and ground red pepper until well blended.
3In 12-inch nonstick ovenproof skillet, arrange wilted spinach, tomato and feta cheese. (If ovenproof skillet is unavailable, wrap skillet handle with foil before placing under broiler.) Pour egg mixture over top. Cover and cook over medium-low heat 6 to 7 minutes or until almost set.
4Uncover skillet; broil about 6 inches from heat 1 minute. Let stand 1 minute before serving.