Melt butter in heavy medium saucepan over medium heat. Add bell pepper and onion and sauté until almost tender, about 3 minutes. Add broth, spinach, cream and crushed red pepper. Cover pan and simmer until spinach is tender, about 3 minutes. Add scallops and simmer uncovered until just opaque in center, about 3 minutes. Mix in basil. Season soup to taste with salt and pepper. Ladle soup into bowls and serve.
