Preheat the oven to 425°F.

Line a large baking sheet with parchment paper.

Cut the bell peppers and red onion into 1/2 inch squares. Separate the onion layers for even cooking.

Cut the sweet potato into 1/4 inch rounds, and cut each round into quarters.

Combine the garlic powder, olive oil, Parmesan, Italian seasoning, and salt in a large mixing bowl. Mixing the seasonings together.

Add the bell peppers, onion, and sweet potato to the mixing bowl. Toss to coat.

Transfer the seasoned vegetables to the prepared baking sheet and spread them into a single layer.

Bake the vegetables on middle rack of oven until they are fork tender, about 25 minutes.

Check to see that vegetables are done. Remove from oven or add time as needed.

Allow vegetables to cool slightly. Serve and enjoy.