Herby, garlicky, creamy Boursin cheese amps up the flavor in this meatless pasta.
Preheat oven to 425 degrees. Using the large holes of a box grater,shred squash until you have 5 cups; cut remaining squash into1/2-inch cubes (about 4 cups). On a rimmed baking sheet, tosssquash cubes with 1 tablespoon oil; season with salt and pepper.Spread in a single layer and roast until tender and browned, about25 minutes.
Meanwhile, cook pasta in a large pot of boiling salted wateraccording to package instructions. Drain, reserving 1 1/2 cups pastawater. Heat a large straight-sided skillet over medium-high. Addremaining 2 tablespoons oil and shredded squash; cook, stirringoccasionally, until caramelized in spots, 10 minutes. Transfer toa blender with reserved pasta water and half of cheese; blenduntil smooth.
Return blended sauce to skillet; stir in pasta and roasted squash.Season with salt and pepper. Serve immediately, topped witharugula, hazelnuts, small dollops of remaining cheese, and adrizzle of oil.