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 and place them on the baking sheet.
Drizzle the vegetables with half of the olive oil and season with a pinch of sea salt and black pepper.
Roast the vegetables for 18-20 minutes until they are tender and show slight caramelized edges.
While the vegetables roast, season the chicken breast evenly with garlic powder, dried oregano, and the remaining salt and pepper.
Heat the remaining olive oil in a stainless steel or cast iron 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 heat and let it rest for 3 minutes before slicing.
Serve the sliced chicken alongside the roasted vegetables and finish with a fresh squeeze of lemon juice over the entire plate.