Preheat your oven to 425°F (220°C) for optimal caramelization.
Wash and dry all vegetables. Dice the onion and bell pepper, cut broccoli into florets, and slice yellow and zucchini squashes.
In a mixing bowl, combine all prepared vegetables, garlic, olive oil, dried basil, and black pepper. Toss until evenly coated.
Spread the coated vegetables in a single layer on the baking sheet, ensuring enough space between pieces.
Roast in the preheated oven for about 25-30 minutes, tossing halfway through for even cooking.
Once roasted, remove from the oven and let cool for a few minutes. Serve warm as a side dish or in salads.
