Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the broccoli into small florets, and dice the red bell pepper and zucchini into 1-inch pieces.
Place the vegetables on the baking sheet, drizzle with 0.5 tbsp of olive oil, and sprinkle with half of the sea salt and black pepper.
Toss the vegetables to coat evenly and roast in the oven for 18-20 minutes until tender and slightly browned.
While the vegetables roast, season the chicken breast on both sides with dried oregano, garlic powder, and the remaining salt and pepper.
Heat the remaining 0.5 tbsp of olive oil in a medium skillet over medium-high heat.
Add the chicken breast to the skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F.
Remove the chicken from the heat and let it rest for 3 minutes before slicing.
Plate the sliced chicken alongside the roasted vegetables and drizzle everything with fresh lemon juice before serving.