1. Preheat oven to 400F. Generously spray a nonstick muffin pan with cooking spray.
2. Gently mix turkey, zucchini, onion, bell pepper, couscous, egg, Worcestershire, mustard, pepper and salt in a large bowl, preferably with your hands, without overworking. Equally divide the mixture among the muffin cups. Spread barbecue sauce on top of each loaf, if using.
3. Bake until the meatloaves are cooked through or an instant-read thermometer inserted into the center registers 165 degrees F, about 25 minutes. Let the loaves stand in the pan for 5 minutes before serving.
6 servings, 2 loaves each.