Preheat your oven to 425°F and line a large sheet pan with parchment paper or foil.
In a large bowl, combine the halved baby potatoes, bell peppers, and red onion wedges.
Drizzle the vegetables with 2 tablespoons of olive oil and season with garlic powder, paprika, Italian seasoning, salt, and pepper, tossing to coat evenly.
Spread the vegetables in a single layer on the prepared sheet pan and roast for 15 minutes.
Remove the pan from the oven and add the rotisserie chicken pieces, drizzling them with the remaining tablespoon of olive oil.
Return the pan to the oven and roast for an additional 10 minutes until the chicken is heated through and the vegetables are tender and caramelized.
Garnish with fresh parsley before serving and enjoy your easy, delicious dinner!