Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Dice the red potatoes and carrots into uniform 1-inch pieces to ensure they cook evenly alongside the chicken.
Place the chicken breast, potatoes, carrots, broccoli florets, and sliced red bell pepper onto the prepared baking sheet.
Drizzle the olive oil over the chicken and vegetables, then sprinkle with minced garlic, dried oregano, dried thyme, sea salt, and black pepper.
Toss everything thoroughly with your hands or tongs until well-coated, then spread into a single layer, ensuring the chicken is not covered by vegetables.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve warm.