1.Preheat the oven to 425°F (220°C) and line a baking sheet with parchment paper.
2. Add the chicken to one side of the baking sheet followed by the zucchini, onion, cauliflower, and sweet potato. Drizzle the oil and lemon juice all over. Season everything with salt, garlic powder, and oregano. Gently toss the chicken and vegetables to coat.
3. Place in the oven and cook for 20 to 25 minutes or until the chicken is cooked through and the vegetables are fork-tender, flipping halfway through.