Ingredients:

• (1/2 cup) plain fat-free yogurt
• (1/4 cup) reduced-fat mayonnaise
• (2 Tbsp.) fresh flat-leaf parsley, chopped
• (3 Tbsp.) green onions, chopped
• (1 Tbsp.) fresh chives, chopped
• (3 Tbsp.) white wine vinegar
• (2 tsp.) anchovy paste
• (1 tsp.) chopped fresh tarragon
• (1/4 tsp.) freshly ground black pepper
• (1/8 tsp.) salt
• (1 clove) garlic, minced
• (8 cups) romaine lettuce, torn
• (1 cup) watercress, trimmed
• (1 1/2 cups) cooked chicken breast, chopped
• (2) tomatoes, each cut into 8 wedges
• (2 large) eggs, hard-cooked, each cut into 4 wedges
• (1/2 cup) avocado, diced and peeled
• (1/4 cup) crumbled blue cheese