Preheat your oven to 425°F and line a large sheet pan with parchment paper or spray with cooking spray.
In a small bowl, whisk together the olive oil, minced garlic, lemon juice, oregano, salt, and pepper.
Place the chicken pieces, halved potatoes, cherry tomatoes, bell pepper, and red onion on the prepared sheet pan.
Drizzle the olive oil mixture over everything and toss until well coated. Spread everything out in a single layer.
Roast for 20-25 minutes, or until the chicken is cooked through (internal temp of 165°F) and the vegetables are tender.
Remove from oven and immediately sprinkle with crumbled feta cheese and fresh parsley. Serve hot!