Shred the Brussel sprouts coarsely using a food processor fitted with a slicing blade (you may also use a knife to slice them but it will take more time). Place the Brussel sprouts onto an XL rimmed baking sheet. Toss with olive oil, salt and pepper to taste to coat well. Spread out evenly in a single layer. Roast for 25 minutes - stir the sprouts and rotate the pan halfway through - until browned. Remove pan from the oven and immediately top with freshly grated parmesan cheese to serve.