Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Dice the chicken breast and the sweet potato into uniform 1-inch cubes to ensure they cook at the same rate.
Chop the broccoli, red bell pepper, zucchini, and red onion into bite-sized pieces.
Place the chicken and all the chopped vegetables into a large mixing bowl.
Drizzle with the extra virgin olive oil and sprinkle with garlic powder, dried oregano, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and spices.
Spread the mixture in a single layer across the prepared baking sheet, ensuring nothing is overcrowded.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the sweet potatoes are fork-tender.
Remove from the oven and immediately drizzle with fresh lemon juice to brighten the flavors.
Serve immediately or divide into airtight containers for a high-protein meal prep option.