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, tossing to coat evenly.
Roast the vegetables in the oven for 18-20 minutes until they are tender and show a slight golden char on the edges.
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 olive oil in a medium skillet over medium-high heat.
Place the chicken in the skillet and sear for 5-7 minutes per side, or until the exterior is crispy and the internal temperature reaches 165°F.
Remove the skillet from the heat and drizzle the fresh lemon juice directly over the chicken, allowing it to sizzle and create a light pan sauce.
Plate the crispy chicken alongside the roasted vegetables and pour any remaining lemon juices from the pan over the top.