Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Dice the red potato into small 1/2-inch cubes, chop the zucchini into half-moons, and slice the bell pepper into bite-sized strips.
Place the chicken breast on one side of the sheet pan and arrange the potatoes, zucchini, peppers, and cherry tomatoes on the other side.
In a small bowl, whisk together the olive oil, lemon juice, oregano, thyme, garlic powder, sea salt, and black pepper.
Drizzle the herb oil mixture over the chicken and the vegetables, using your hands or a spatula to toss everything until thoroughly and evenly coated.
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 potatoes are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep the juices intact, then serve immediately with the roasted vegetables.