Heat oven to 425°F. On large rimmed baking sheet, toss red peppers and garlic with oil and 1/4 tsp each salt and pepper; arrange in even layer. Roast until peppers are tender, 25 to 30 minutes.
STEP 2
While vegetables are roasting, cook pasta per package directions. Reserve 1/2 cup cooking water; drain pasta and return to pot. Toss with 3 tbsp fresh lemon juice.
STEP 3
When vegetables are done, transfer to blender, add cream and Parmesan and puree until smooth.
STEP 4
Reheat pepper sauce if necessary. Toss pasta with sauce to coat, adding some reserved pasta water as necessary, then fold in basil. Serve sprinkled with additional Parmesan if desired.