Preheat your grill to medium-high heat and your oven to 425°F for roasting the broccoli.
Season the chicken breast with a pinch of salt and black pepper on both sides.
Grill the chicken for about 6-7 minutes per side or until the internal temperature reaches 165°F. Once cooked, let it rest for a few minutes before slicing.
While the chicken grills, rinse the quinoa and cook it according to package instructions. Typically, simmer 1/2 cup dry quinoa in water until the quinoa becomes fluffy, yielding about 1 cup cooked.
In a bowl, toss the broccoli with olive oil, salt, and pepper. Spread it on a baking sheet in a single layer.
Roast the broccoli in the preheated oven for about 15 minutes, until the edges are slightly crispy and the broccoli is tender.
Plate the warm quinoa, top with sliced grilled chicken, and add the roasted broccoli on the side. Serve immediately and enjoy a balanced, nutritious meal.