Preheat your grill or grill pan over medium-high heat.
Season the chicken breast with salt and pepper on both sides.
Grill the chicken for about 6-7 minutes per side or until fully cooked and grill marks appear.
While the chicken is grilling, rinse the quinoa under cold water.
In a small saucepan, combine the rinsed quinoa with water (use a 1:2 ratio of quinoa to water), bring it to a boil, then reduce the heat, cover, and simmer for about 15 minutes until water is absorbed and quinoa is fluffy.
Meanwhile, preheat your oven to 425°F.
Toss the chopped broccoli with olive oil, salt, and pepper. Spread it out on a baking sheet.
Roast the broccoli in the oven for about 12-15 minutes, until the edges are slightly crispy.
Plate the grilled chicken breast alongside a serving of quinoa and roasted broccoli, and enjoy your balanced lunch!