Preheat your oven to 400°F (205°C) and line a large rimmed baking sheet with parchment paper.
Slice the red bell pepper into thin strips and the carrots into rounds.
Place the broccoli florets, bell pepper strips, and carrots on the baking sheet; toss with 0.5 tablespoons of olive oil and a pinch of sea salt and black pepper.
Spread the vegetables in a single layer and roast for 18 to 20 minutes until tender and slightly caramelized at the edges.
While vegetables roast, season the chicken breast on both sides with garlic powder, dried oregano, and the remaining sea salt and black pepper.
Heat the remaining 0.5 tablespoons of olive oil in a medium skillet over medium-high heat.
Add the chicken to the skillet and sear for 6 to 7 minutes per side, or until the internal temperature reaches 165°F (74°C) and the exterior is golden brown.
Remove the chicken from the pan and let it rest for 5 minutes before slicing it into strips.
Plate the sliced chicken alongside the roasted vegetables and serve immediately.