Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Slice the carrot into rounds and the red bell pepper into bite-sized pieces.
Toss the broccoli, carrot, and bell pepper with half of the olive oil and a pinch of the salt and pepper on the prepared baking sheet.
Roast the vegetables for 15-20 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, sea salt, and black pepper.
Heat the remaining olive oil in a skillet over medium-high heat.
Sear the chicken for 6-7 minutes per side until the exterior is golden brown and the internal temperature reaches 165°F.
Let the chicken rest for 5 minutes before slicing and serving alongside the roasted vegetables.