Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Slice the red bell pepper and carrots into bite-sized pieces.
Place the broccoli, peppers, and carrots on the baking sheet, drizzle with half of the avocado oil, and season with a pinch of sea salt and black pepper.
Roast the vegetables in the oven for 18 to 20 minutes until they are tender and slightly caramelized at the edges.
While the vegetables roast, season the chicken breast evenly on both sides with garlic powder, dried oregano, and the remaining salt and pepper.
Heat the remaining avocado oil in a cast-iron or stainless steel skillet over medium-high heat.
Place the chicken in the hot skillet and sear for 6 to 7 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
Remove the chicken from the pan and let it rest for 3 minutes before slicing.
Plate the juicy sliced chicken alongside the roasted vegetable medley and serve immediately.