Preheat oven to 400°F and line a large sheet pan with parchment paper.
Trim the woody ends from the asparagus and slice the zucchini into half-moons.
Slice the chicken breast into even 1-inch thick strips to ensure uniform cooking.
In a small bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, sea salt, thyme, and rosemary.
Place the chicken, asparagus, and zucchini on the prepared sheet pan.
Pour the lemon-herb dressing over the ingredients and toss thoroughly with your hands to coat every piece.
Spread everything into a single layer, ensuring the chicken isn't crowded by the vegetables.
Roast for 18 to 20 minutes until the chicken is cooked through and the vegetables are tender and slightly golden.