Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast and sweet potato into 1-inch cubes to ensure they cook evenly.
Chop the broccoli into small florets and dice the red bell pepper and red onion into similar bite-sized pieces.
In a large mixing bowl, combine the chicken, sweet potato, and vegetables with the extra virgin olive oil.
Sprinkle the garlic powder, smoked paprika, sea salt, and black pepper over the mixture and toss until everything is well-coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the pieces aren't crowded so they roast rather than steam.
Roast in 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 drizzle with fresh lemon juice to brighten the flavors before portioning into containers.