Beef and Spinach Breakfast Sandwich

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12 ounces cooked beef (such as steak, roast, pot roast or deli roast beef), thinly sliced

4 eggs or 1 cup egg substitute

1/2 cup chopped fresh baby spinach

1/2 cup diced tomatoes

Salt and pepper (optional)

4 slices reduced-fat Swiss cheese

4 whole wheat round thin sandwich breads, split, toasted