Whisk egg and 2 tablespoons water in medium bowl to blend. Mix in breadcrumbs; let stand one minute.
Add turkey, parmesan cheese, parsley, garlic, salt, and pepper; gently stir to blend.
Using wet hands, shape turkey mixture into 1 ¼-inch-diameter meatballs. Place on baking sheet; chill while you prepare the next steps, or 30 minutes, if you have the time.
Bring chicken broth to a boil in large (4 to 5-quart) pot.
Add carrots and orzo; reduce heat to medium and simmer uncovered 8 minutes.
Add turkey meatballs and simmer 10 minutes.
Stir in chopped greens and simmer until turkey meatballs, orzo, and escarole are tender, about 5 minutes longer.
Season soup to taste with salt and pepper.
Ladle soup into bowls and serve.
This be made 2 hours ahead. Rewarm over medium heat, thinning with more broth if needed or desired.
