Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the chicken breast, sweet potato, and red bell pepper into uniform 1-inch pieces.
In a large mixing bowl, whisk together the olive oil, lemon juice, oregano, thyme, garlic powder, sea salt, and black pepper.
Add the chicken, diced sweet potato, bell pepper, and broccoli florets to the bowl, tossing thoroughly to ensure everything is coated in the herb oil.
Spread the mixture in a single, even layer onto the prepared baking sheet, ensuring the pieces aren't overcrowded to allow for crisping.
Roast in the center of the oven for 20 to 25 minutes, tossing the ingredients halfway through the cooking time.
Check that the chicken is cooked through and the sweet potatoes are tender with golden edges.
Remove from the oven and serve immediately while the vegetables are hot and the chicken is juicy.