Preheat the oven to 425°F (220°C).
In a large mixing bowl, combine the olive oil, paprika, garlic powder, dried oregano, salt, and pepper.
Add the chicken thighs to the bowl and coat them thoroughly with the seasoning mixture.
Place the seasoned chicken on one side of the sheet pan.
In the same bowl, add the halved baby potatoes, chopped red bell pepper, sliced zucchini, and red onion. Toss to coat the vegetables in any remaining seasoning.
Spread the vegetables on the empty side of the sheet pan, keeping them separate from the chicken.
Roast in the preheated oven for 30-35 minutes, or until the chicken is golden brown and the internal temperature reaches 165°F (75°C) and the vegetables are tender.
Remove from the oven and let rest for 5 minutes.
Garnish with fresh parsley before serving.
Enjoy your delicious and easy sheet pan chicken dinner!