Preheat your grill or grill pan over medium-high heat.
Season the chicken breast with your choice of spices (salt, pepper, and a squeeze of lemon work well).
Grill the chicken breast for about 6-7 minutes per side or until it reaches an internal temperature of 165°F.
While the chicken is grilling, preheat the oven to 425°F for the broccoli.
Toss the broccoli in a small amount of olive oil, salt, and pepper, then spread it evenly on a baking sheet.
Roast the broccoli in the oven for 15-20 minutes until it is slightly crispy on the edges and tender inside.
Prepare the cooked quinoa according to package instructions if not already cooked.
Once everything is cooked, plate the grilled chicken alongside the roasted broccoli and a serving of quinoa.
Drizzle any remaining olive oil over the broccoli for extra flavor if desired, and serve warm.