Preheat oven to 500 degrees. On a parchment-lined baking sheet, drizzle the brussell sprouts with olive oil. Salt and pepper generously.

Place brussell sprouts into the preheated oven. Allow to roast for 15-20 minutes, or until the edges of the brussell sprouts begin to char slightly. Toss the chopped hazelnuts on top of the brussell sprouts and allow them to cook about 5 minutes longer.

Remove from oven, drizzle with truffle oil. Serve and enjoy.