Cook spaghetti according to directions on package; drain and keep warm. In saucepan combine undrained tomatoes, tomato paste, onion, oregano, basil, red pepper, garlic powder and thyme. Cook uncovered over medium-low heat 10 minutes until mixture is somewhat thickened, stirring occasionally. Add shrimp and green pepper, cook uncovered 10 minutes until shrimp are no longer pink, stirring occasionally. Serve over spaghetti. Serves 6. This is a low cal/low fat meal.