In a bowl, beat the egg whites, eggs, milk, seasoned salt and pepper. Pour into a 10-inch overnproof skillet coated with nonstick cooking spray. Sprinkle with the ham, broccoli, cheese, tomato and onion. Bake, uncovered, at 350 degrees for 30-35 minutes or until eggs are almost set. Broil 4-6 in. from the heat for 1-2 minutes or until the eggs are set and top is lightly browned.