Preheat oven to 400.
Heat 2 tablespoons oil in a 10-12" nonstick, oven safe skillet over medium-high. Whisk eggs with remaining oil, salt and pepper, set aside. Saute greens, chopped leek or spring onions and arugula, spinach or greens until tender. Add egg mixture and cook 5-6 minutes or until edges begin to pull away from the sides of the pan. Sprinkle with cheese and bake in oven 8-10 minutes or until set (or turn heat down, cover with lid and bake 8 minutes). Remove from heat, slice and serve. May be cooled and refrigerated for up to a day and served cold, room temp or warm.