Preheat your grill to medium-high heat, around 400°F (200°C). Allow 10-15 minutes for the grill to reach the ideal temperature.

Wash and cut baby potatoes into bite-sized pieces. Place in a bowl and drizzle with olive oil, garlic powder, salt, and pepper. Toss to coat well.

Chop bell peppers and red onion into uniform pieces. Combine with seasoned potatoes in the mixing bowl.

Transfer the mixture to a grill basket or onto grill grates in a single layer.

Place the grill basket on the grill, close the lid, and cook for 15-20 minutes, stirring occasionally until tender and slightly crispy.

Check for doneness; potatoes should be golden brown and fork-tender while veggies should be charred but still crunchy.

Remove from the grill and let rest for a few minutes. Serve alongside grilled meats or as a part of a vegetarian spread.