Preheat your oven to 400°F (200°C) or set your air fryer to 375°F.
Peel and dice the sweet potato and carrots into uniform 1/2-inch cubes.
Cut the chicken breast into even-sized strips or keep whole for even cooking.
In a large bowl, whisk together the olive oil, garlic powder, onion powder, thyme, rosemary, black pepper, and lemon juice.
Toss the chicken, sweet potatoes, carrots, and broccoli florets in the herb mixture until thoroughly coated.
If using an oven, spread the mixture on a parchment-lined baking sheet in a single layer and roast for 20-25 minutes until the chicken reaches 165°F.
If using an air fryer, place the ingredients in the basket and cook for 15-18 minutes, shaking halfway through to ensure the vegetables are crisp and golden.
Serve immediately while the herbs are fragrant and the vegetables are tender.