- Preheat the oven to 400°F (200°C).
- In a large bowl, combine the chopped bell peppers, zucchini, cherry tomatoes, and red onion.
- Drizzle with olive oil, and season with salt and pepper. Toss to coat the vegetables evenly.
- Spread the vegetables on a baking sheet in a single layer.
- Roast in the preheated oven for 20-25 minutes, or until the vegetables are tender and caramelized.
- Remove from the oven and let cool slightly.
- Drizzle with balsamic vinegar and toss gently.
- Serve warm or at room temperature, garnished with fresh basil leaves.
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