Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Place the cubed sweet potatoes, broccoli florets, sliced bell peppers, and red onion on the baking sheet.
Drizzle the vegetables with 0.5 tablespoon of avocado oil and season with 0.25 teaspoon of sea salt and 0.125 teaspoon of black pepper, tossing to coat evenly.
Roast the vegetables in the oven for 20-25 minutes, or until the sweet potatoes are tender and the broccoli edges are slightly charred.
While the vegetables roast, season the chicken breast on both sides with garlic powder, dried oregano, and the remaining sea salt and black pepper.
Heat the remaining 0.5 tablespoon of avocado oil in a cast-iron or heavy-bottomed skillet over medium-high heat.
Place the chicken in the hot skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F and the surface is beautifully golden.
Remove the chicken from the pan and let it rest for 5 minutes before slicing it against the grain.
Serve the sliced chicken alongside the warm roasted vegetables for a complete, clean-eating meal.