Preheat your oven to 190C
Place your squash in a baking tray, drizzle with one tablespoon of the olive oil and sprinkle with a little salt and black pepper, shake to coat and roast for 30-40 minutes, stirring occasionally, until the squash is soft and beginning to brown
Bring a large pan of water to the boil, add a pinch of salt and cook the pappardelle according to the packet instructions until al dente, drain well
While the pasta is cooking heat the remaining oil in a large frying pan and sauté the mushrooms until they have released their juices and the juices have fried off, add the garlic, sage, chopped chestnuts, cooked squash and cook gently for 2 minutes
Add the drained pasta to the frying pan of veg and use two forks to toss it all together
Serve topped with freshly grated vegan cheese and ground black pepper to taste