Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash the zucchini and slice into 1/2-inch thick rounds, then place them on one side of the prepared baking sheet.
Pat the chicken breast completely dry with paper towels and place it on the other side of the tray.
In a small bowl, whisk together the olive oil, lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper.
Drizzle half of the lemon-herb mixture over the zucchini and toss to coat evenly, spreading them out in a single layer.
Brush the remaining mixture over both sides of the chicken breast, ensuring it is well-coated for maximum flavor.
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 zucchini is tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays juicy and flavorful.