Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Toss the broccoli, bell pepper, and zucchini with 1 tablespoon of olive oil, half the salt, and half the pepper on the prepared sheet.
Roast the vegetables for 18-20 minutes until they are tender and slightly charred.
While vegetables roast, season the chicken breast with oregano, garlic powder, and the remaining salt and pepper.
Heat the remaining 0.5 tablespoon of olive oil in a skillet over medium-high heat.
Sear the chicken for 5-7 minutes per side until the internal temperature reaches 165°F and the exterior is golden brown.
Remove chicken from heat, let it rest for 3 minutes, then drizzle with fresh lemon juice.
Serve the juicy chicken alongside the roasted vegetables.