Preheat your oven to 425°F.
Place the chicken breast on a sheet pan and season with salt, pepper, garlic powder, dried thyme, and dried rosemary.
Drizzle half of the olive oil and the lemon juice over the chicken, gently massaging the marinade into the meat.
In a separate bowl, toss the broccoli florets with the remaining olive oil, a pinch of salt, and a dash of pepper.
Arrange the broccoli around the chicken on the sheet pan, ensuring even spacing for proper roasting.
Place the sheet pan in the oven and roast for about 20-25 minutes, or until the chicken is cooked through (internal temperature of 165°F) and the broccoli is crispy on the edges.
While the chicken and broccoli are roasting, prepare the quinoa if not pre-cooked.
Once done, remove from the oven and serve the chicken and broccoli alongside the warm quinoa for a balanced meal.