Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Place the broccoli florets, sliced red bell pepper, and diced red onion on the baking sheet.
Drizzle the vegetables with half of the olive oil and sprinkle with a pinch of the sea salt and black pepper, tossing to coat evenly.
Roast the vegetables in the oven for 18-20 minutes until they are tender and show slight caramelization on the edges.
While the vegetables roast, pat the chicken breast dry and season both sides with the garlic powder, dried oregano, and the remaining salt and pepper.
Heat the remaining olive oil in a medium skillet over medium-high heat until shimmering.
Add the chicken breast to the skillet and sear for 5-7 minutes per side, or until the internal temperature reaches 165°F and the crust is golden brown.
Remove the chicken from the pan and let it rest for 3 minutes before slicing.
Serve the sliced chicken alongside the warm roasted vegetables for a clean and balanced meal.