
Preheat the oven to 425°F (220°C).
In a large bowl, combine the Brussels sprouts, carrots, bell peppers, and red onion.
In a small bowl, whisk together the balsamic vinegar, olive oil, honey (or maple syrup), salt, and pepper.
Pour the balsamic mixture over the vegetables and toss to coat evenly.
Spread the vegetables in a single layer on a baking sheet.
Roast in the preheated oven for 25-30 minutes, stirring halfway through, until the vegetables are tender and caramelized.
Serve warm and enjoy!