Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
In a small bowl, whisk together the olive oil, minced garlic, thyme, oregano, rosemary, salt, and pepper to create the marinade.
Place the halved potatoes on the baking sheet and toss with 1 tablespoon of the marinade. Arrange them around the edges of the pan.
Pat the chicken thighs completely dry with paper towels. Rub the remaining marinade thoroughly over and under the chicken skin. Place the chicken in the center of the baking sheet.
Bake for 20 minutes.
Remove the pan from the oven. Toss the broccoli florets and red bell pepper chunks with a drizzle of olive oil and a pinch of salt, then add them to the baking sheet in the spaces between the chicken and potatoes.
Return the pan to the oven and bake for another 15-20 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
Optional: Switch the oven to broil for the last 1-2 minutes to extra-crisp the chicken skin, watching closely to prevent burning.
Garnish with fresh parsley or lemon wedges before serving.