Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Wash and dice the zucchini, red bell pepper, red onion, and baby potatoes into uniform, bite-sized pieces.
Mince the garlic cloves finely.
In a large mixing bowl, toss the chopped vegetables and potatoes with half of the olive oil, half of the oregano, half of the thyme, and a pinch of salt and pepper.
Spread the vegetable mixture in a single layer across the prepared baking sheet.
Season the chicken breast evenly on both sides with the remaining olive oil, oregano, thyme, salt, pepper, and minced garlic.
Nestle the chicken breast onto the baking sheet among the 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 potatoes are fork-tender.
Remove from the oven and immediately drizzle the fresh lemon juice over the chicken and vegetables before serving.