Preheat your oven to 400°F (200°C).
Chop the broccoli, red bell pepper, and zucchini into uniform bite-sized pieces.
Place the vegetables on a baking sheet and toss with half of the olive oil, a pinch of sea salt, and a pinch of black pepper.
Roast the vegetables in the oven for 15-20 minutes until they are tender and slightly charred at the 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 an oven-safe skillet over medium-high heat.
Place the chicken in the skillet and sear for 3-4 minutes per side until a golden-brown crust forms.
Drizzle the lemon juice over the chicken and transfer the skillet into the oven for 5-7 minutes, or until the internal temperature reaches 165°F.
Remove from the oven and let the chicken rest for 3 minutes before slicing.
Plate the crispy chicken alongside the roasted vegetables and serve immediately.