Preheat your oven to 400°F and line a large baking sheet with parchment paper.
In a medium bowl, toss the broccoli florets, sliced carrots, and sliced zucchini with 0.5 tbsp of the olive oil and half of the sea salt and black pepper.
Spread the vegetables in a single layer on the prepared baking sheet and roast for 18 to 20 minutes until they are tender-crisp.
While the vegetables roast, season the chicken breast evenly on both sides with the dried oregano, garlic powder, and the remaining sea salt and black pepper.
Heat the remaining 0.5 tbsp of olive oil in a non-stick skillet over medium-high heat.
Place the chicken in the skillet and sear for 6 to 8 minutes per side until the exterior is golden brown and the internal temperature reaches 165°F.
During the final minute of cooking, pour the lemon juice over the chicken to deglaze the pan and coat the meat.
Serve the crispy chicken breast alongside the roasted vegetables immediately for a fresh and balanced meal.