Preheat the grill to medium-high heat.
Season the chicken breast with your favorite spices (salt, pepper, and a squeeze of lemon work beautifully).
Grill the chicken for about 6-7 minutes on each side until fully cooked and the internal temperature reaches 165°F.
While the chicken is grilling, preheat your oven to 425°F for the broccoli.
Toss the broccoli with olive oil, salt, and pepper, and spread it out on a baking sheet.
Roast the broccoli in the oven for about 15 minutes until tender and slightly browned.
Prepare the quinoa according to package instructions if not pre-cooked. Typically, this involves boiling it until the water is absorbed.
Plate the grilled chicken alongside the quinoa and roasted broccoli, and serve warm.