1. Bring a large pot of water to a boil. Add the pasta and cook according to package directions. Drain and keep warm.

2. Meanwhile, heat the oil in a nonstick saucepan over meium-low heat. Add the onion and garlic; cook until th eonion is soft, about five minutes. Stir in the roasted peppers and basil; cook about one minute longer to allow the flavors to blend. Add the broth; simmer, uncovered, 10 minutes longer. Remove from the heat and stir in the half-and-half.

3. Puree the sauce in a food processor or blender. Pour the sauce over the pasta and toss to coat.