Penne with Butternut Squash and Goat Cheese

butternut squash, peeled, seeded and cut into 3/4-inch cubes

yellow onion, diced into 1/2-inch pieces

Olive oil, for drizzling

Kosher salt and freshly ground black pepper

penne pasta (any kind)

goat cheese, crumbled

coarsely chopped walnuts, toasted (see Note)

packed cup chopped fresh basil leaves

finely grated Parmesan