Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Place the broccoli florets, sliced red bell pepper, and red onion on the baking sheet, then drizzle with half of the olive oil and a pinch of salt and pepper.
Toss the vegetables to coat evenly and roast in the oven for 18 to 20 minutes until they are tender and show slight caramelized edges.
While the vegetables roast, season the chicken breast on both sides with the ground turmeric, garlic powder, remaining salt, and remaining black pepper.
Heat the remaining olive oil in a heavy-bottomed skillet over medium-high heat until shimmering.
Add the chicken to the pan and sear for 6 to 7 minutes per side until the exterior is beautifully golden and the internal temperature reaches 165°F.
Remove the chicken from the pan and let it rest for 5 minutes before slicing it into strips.
Plate the sliced chicken alongside the roasted vegetable medley and serve immediately while hot.