Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Slice the red bell pepper and zucchini into bite-sized pieces and combine them with the broccoli florets on the baking sheet.
Drizzle the vegetables with half of the olive oil and season with half of the salt and pepper, tossing to coat evenly.
Roast the vegetables in the oven for 18-20 minutes until they are tender and show slight caramelized edges.
While vegetables roast, season the chicken breast on both sides with garlic powder, onion powder, smoked paprika, and the remaining salt and pepper.
Heat the remaining olive oil in a large skillet over medium-high heat.
Place the chicken in the pan and sear for 6-7 minutes per side, or until the exterior is golden brown and the internal temperature reaches 165°F.
Remove the chicken from the heat and let it rest for 3 minutes before slicing.
Plate the juicy chicken alongside the roasted vegetable medley and serve immediately.