Preheat oven to 400 degrees F.
Place Brussels sprouts, Cauliflower, salt and pepper in a large bowl. Drizzle with oil and sprinkle salt and pepper.
Mix well. Pour mixture on a baking dish.
Roast for about 20-25 minutes, or until vegetables are tender.
Transfer to a serving dish. Stir in cooked bacon and balsamic vinaigrette.
Serve immediately and enjoy!