Preheat your oven to 425°F (220°C) and line a large baking sheet with parchment paper.
Pat the chicken breast completely dry with paper towels to ensure the exterior becomes golden and crispy.
Mince the garlic cloves and zest half of the lemon into a small mixing bowl.
Trim the woody ends off the asparagus and slice the zucchini into half-moons.
In a large bowl, toss the chicken, asparagus, and zucchini with olive oil, rosemary, thyme, salt, pepper, minced garlic, and lemon zest until evenly coated.
Spread the chicken and vegetables in a single layer on the prepared baking sheet.
Slice the remaining lemon into thin rounds and arrange them over the chicken and vegetables.
Roast for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly charred.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy.