Preheat your grill or grill pan over medium-high heat.
Season the chicken breast with your preferred spices (a pinch of salt, pepper, and garlic powder works well).
Grill the chicken for about 5-6 minutes per side or until the internal temperature reaches 165°F.
While the chicken is cooking, preheat the oven to 425°F for the broccoli.
Toss the broccoli with olive oil, salt, and pepper, then spread it evenly on a baking sheet.
Roast the broccoli in the oven for 15-20 minutes until tender and slightly crispy on the edges.
Prepare quinoa according to package instructions if not already cooked. For a 1/2 cup serving, bring water to boil, add quinoa, reduce heat, cover, and simmer for about 15 minutes.
Plate the grilled chicken alongside the quinoa and roasted broccoli.
Drizzle any remaining olive oil over the dish for extra flavor if desired, and serve warm.