Preheat your oven to 400°F (200°C).
Toss the halved Brussels sprouts in olive oil, salt, and pepper.
Spread the Brussels sprouts on a baking sheet and roast for 25-30 minutes until caramelized.
While the sprouts are roasting, cook the wild rice according to package instructions until tender.
In a saucepan over medium heat, combine heavy cream and grated Parmesan cheese.
Once the Parmesan is melted, stir in the truffle oil and fresh thyme; season with salt and pepper.
Combine the cooked wild rice, roasted Brussels sprouts, and toasted walnuts in a serving bowl.
Drizzle additional truffle oil on top before serving, if desired.