Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Chop the red bell pepper and red onion into bite-sized pieces.
In a large bowl, toss the broccoli florets, bell pepper, and red onion with 0.5 tablespoon of olive oil and a pinch of sea salt.
Spread the vegetables in a single layer on the prepared baking sheet and roast for 18-20 minutes until they are tender and slightly caramelized.
While the vegetables roast, season both sides of the chicken breast with the remaining sea salt, black pepper, garlic powder, and dried oregano.
Heat the remaining 0.5 tablespoon of 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 exterior is golden brown.
Remove the chicken from the pan and let it rest for 3 minutes before slicing.
Serve the sliced chicken alongside the roasted vegetables for a clean and nutrient-dense meal.