Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Chop the broccoli, red bell pepper, and zucchini into bite-sized pieces.
Toss the vegetables on the baking sheet with 0.5 tbsp of olive oil and a pinch of sea salt and black pepper.
Roast the vegetables for 15-20 minutes until they are tender and slightly charred at the edges.
While the vegetables roast, season the chicken breast evenly on both sides with garlic powder, dried oregano, and the remaining salt and pepper.
Heat the remaining 0.5 tbsp of olive oil in a stainless steel or cast-iron skillet over medium-high heat.
Place the chicken in the skillet and sear for 5-7 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 to lock in the juices before slicing.
Plate the sliced chicken alongside the roasted vegetables and serve immediately.