1. Preheat broiler.
2. Cut bell peppers in half lengthwise; discard seeds and membranes. Place pepper halves, skin sides up, on a foil-lined baking sheet; flatten with hand. Broil 15 minutes or until blackened. Place in a paper bag; fold to close tightly. Let stand 20 minutes. Peel and chop; set aside.
3. Cook fettuccine according to the package directions, omitting salt and fat; drain well. Set aside; keep warm.
4. Heat 2 tablespoons olive oil and butter in a large skillet over medium-high heat. Add chopped onion and garlic to pan, and cook for 4 minutes or until the onion is tender, stirring frequently. Add shrimp to the pan, and cook for 2 minutes. Add bell peppers and 1/4 cup lemon juice to the pan, and cook for 4 minutes or until the shrimp are done and half of the liquid has evaporated. Add chopped parsley and the next 5 ingredients (through 1/2 teaspoon crushed red pepper) to the shrimp mixture. Remove pan from heat.
5. Combine cooked fettuccine and 1 teaspoon olive oil in a large bowl; toss well. Add shrimp mixture, tossing gently to coat. Top each serving with cheese.