Preheat the oven to 400°F (200°C).

In a mixing bowl, combine the cubed sweet potatoes, bell pepper, zucchini, and red onion.

Drizzle with olive oil and sprinkle with garlic powder, paprika, salt, and black pepper. Toss to coat evenly.

Spread the vegetable mixture in a single layer on a baking sheet.

Roast in the preheated oven for 25-30 minutes, or until the sweet potatoes are tender and lightly browned, stirring halfway through.

Remove from the oven and garnish with fresh parsley before serving.