Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Peel and cube the sweet potato into small half-inch pieces, slice the zucchini into rounds, and mince the garlic cloves.
In a small bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, minced garlic, dried rosemary, sea salt, and black pepper.
Place the chicken breast on one side of the sheet pan and arrange the sweet potato, broccoli, and zucchini on the other side.
Drizzle the lemon-garlic oil mixture over the chicken and vegetables, tossing the vegetables and brushing the chicken to ensure everything is evenly coated.
Roast in the oven for 20-25 minutes, or until the chicken reaching an internal temperature of 165°F and the sweet potatoes are tender and golden.
Let the chicken rest for 5 minutes before slicing and serving alongside the roasted vegetable medley.