In a large saucepan or Dutch oven combine vegetable broth or chicken broth, peas and carrots, green onion, pepper, and nutmeg. Bring to boiling. Reduce heat and simmer, covered, about 5 minutes or until vegetables are tender.
Meanwhile, gradually stir half-and-half or light cream into flour until smooth. Stir flour mixture into vegetable mixture. Cook and stir over medium heat until bubbly; cook and stir for 1 minute more. Stir in shrimp and mustard; heat through. If desired, garnish each serving with parsley. Makes 4 servings.