In a heavy 2 quart saucepan, bring the broth to a boil. Beat the egg and cheese together in a small bowl until thoroughly blended. Add the spinach to the broth, simmer 1 minute; add the egg/cheese mixture to the simmering broth, stirring constantly. By stirring vigorously, you will make short "rags", a slower stirring will result in larger "rags". Cook until just set, only a few seconds. Season to taste with salt and pepper; serve immediately.
Per Serving: 60 Calories (44.4% from fat); 3g Fat (1g Sat, 1g Mono, tr Poly); 6g Protein; 2g Carbohydrate; tr Dietary Fiber; 57mg Cholesterol; 869mg Sodium. Food Exchanges: 1/2 Lean Meat.