preheat griddle over medium heat. when several drops of water sprinkled on griddle skater and dissipate, add onions, and garlice and saute until onions are soft about 5 minutes.
Add zucchini, corn and potatoes and continue to saute for another 5 minutes.
IN bowl whisk together eggs, egg whites, milk and salt and pepper. add mixture to vegetables evenly.
cook mixture over med low heat for 3 minutes then cover with large lid and continue to cook for 8-10 ,minutes.
Sprinkle cheese on top and recover for additional 1-2 minutes. Serve warm.