Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the bell pepper and zucchini into bite-sized pieces.
In a large bowl, toss the broccoli florets, bell pepper, and zucchini with half of the olive oil and half of the sea salt and black pepper.
Spread the vegetables in a single layer on the prepared baking sheet and roast for 18-20 minutes until tender and slightly caramelized.
While the vegetables roast, season the chicken breast evenly on both sides with the remaining sea salt, black pepper, garlic powder, and dried oregano.
Heat the remaining olive oil in a cast-iron or stainless steel skillet over medium-high heat.
Place the chicken in the skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F and the surface is golden brown.
Remove the chicken from the pan and let it rest for 5 minutes to lock in the juices before slicing.
Serve the sliced chicken alongside the roasted vegetable medley for a clean and balanced meal.