Preheat the oven to 425°F (220°C).

In a mixing bowl, combine the diced bell peppers, zucchini, sliced carrots, and broccoli florets.

Drizzle the olive oil over the vegetables and sprinkle with salt, black pepper, garlic powder, and dried thyme.

Toss the vegetables until evenly coated.

Spread the vegetable mixture 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 slightly caramelized.

Remove from the oven and let cool slightly before serving.