Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast and sweet potato into bite-sized cubes, and slice the bell peppers into strips.
In a large mixing bowl, combine the chicken, broccoli, bell peppers, and sweet potato.
Add the olive oil, minced garlic, sea salt, black pepper, and dried oregano to the bowl and toss thoroughly to coat all ingredients.
Spread the mixture in a single even layer on the prepared baking sheet to ensure everything roasts properly.
Bake for 20 to 25 minutes until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
Remove from the oven and drizzle the fresh lemon juice over the tray before portioning into meal prep containers.