Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Slice the carrot into thin rounds and toss them on the baking sheet with the broccoli florets and bell pepper strips.
Drizzle half of the avocado oil over the vegetables and season with a pinch of sea salt and black pepper.
Roast the vegetables in the oven for 15 to 20 minutes until they are tender and show slight caramelized edges.
While the vegetables roast, season the chicken breast evenly on both sides with the garlic powder, dried oregano, and remaining salt and pepper.
Heat the remaining avocado oil in a medium skillet over medium-high heat.
Place the chicken in the hot skillet and sear for 5 to 7 minutes per side, or until the exterior is golden brown and the internal temperature reaches 165°F.
Remove the chicken from the heat and let it rest for 3 minutes before slicing.
Plate the juicy pan-seared chicken alongside the roasted vegetable medley and serve immediately.