Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Place the broccoli florets, sliced bell pepper, red onion wedges, and cubed sweet potato on the prepared baking sheet.
Drizzle the vegetables with 0.5 tablespoon of avocado oil and sprinkle with half of the sea salt, black pepper, garlic powder, and dried oregano.
Toss the vegetables thoroughly to ensure an even coating of oil and spices, then spread them out in a single layer.
Roast the vegetables in the oven for 20 to 25 minutes, or until the sweet potatoes are tender and the edges are golden brown.
While the vegetables roast, season the chicken breast on both sides with the remaining sea salt, black pepper, garlic powder, and dried oregano.
Heat the remaining 0.5 tablespoon of avocado oil in a medium skillet over medium-high heat until shimmering.
Carefully place the chicken breast in the pan and sear for 6 to 8 minutes per side, or until the exterior is golden and the internal temperature reaches 165°F.
Allow the chicken to rest for 3 minutes before slicing it against the grain to maintain its juicy texture.
Plate the sliced chicken alongside the roasted vegetable medley and serve immediately while hot.