1. Combine chicken broth, corn, onion, bell pepper, carrots, potatoes, bay leaf, 1 cup water and 1 tsp. salt in slow cooker. Cover and cook on low until vegetables are tender, about 6 hours.
2. Puree 3 cups of soup in a blender and return to slow cooker. Stir in shrimp. Cover and cook until shrimp are pink and firm, 10 to 15 minutes. Stir in cream, if desired, and cook until warmed through, about 2 minutes. Season with salt and pepper, sprinkle with parsley and serve.