Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Peel and dice the sweet potato into 1/2-inch cubes, and chop the broccoli and red bell pepper into bite-sized pieces.
Slice the chicken breast into even 1-inch strips to ensure the meat stays juicy and cooks at the same rate as the vegetables.
In a large mixing bowl, combine the chicken, sweet potatoes, broccoli, and peppers with the avocado oil, rosemary, thyme, garlic powder, salt, and pepper.
Toss everything thoroughly until the herbs and oil are evenly distributed across all ingredients.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the pieces are not crowded so they roast rather than steam.
Bake for 20-25 minutes, tossing halfway through, until the chicken is cooked through to 165°F and the sweet potatoes are fork-tender.