Preheat your oven to 425°F. Toss the broccoli with a drizzle of olive oil, salt, and pepper, and spread it evenly on a baking sheet.
Roast the broccoli in the oven for about 15-18 minutes until the edges are slightly crispy and the florets are tender.
While the broccoli roasts, season the chicken breast lightly with salt and black pepper.
Heat a skillet over medium-high heat. Once hot, add the chicken breast and sear for about 3-4 minutes per side, ensuring a golden-brown crust forms.
After searing, lower the heat to medium and cook until the chicken reaches an internal temperature of 165°F, about 5 more minutes, depending on thickness.
Prepare the quinoa according to package instructions if not already cooked. Typically, combine 1 part quinoa with 2 parts water, bring to a boil, then simmer for 15 minutes until water is absorbed.
Plate the seared chicken breast with the roasted broccoli and a serving of quinoa. Drizzle any remaining olive oil over the broccoli for extra flavor if desired.
Serve warm and enjoy your balanced, gluten-free dinner.