Preheat your oven to 425°F (220°C) for roasting.
In a small bowl, mix olive oil, lemon juice, dried thyme, salt, and pepper to create a marinade.
Place the chicken breast in a baking dish and coat it evenly with the marinade. Allow to rest for 10 minutes.
On a baking tray, toss broccoli with a drizzle of olive oil, salt, and pepper.
Place both the chicken and broccoli in the oven. Roast the chicken for about 20-25 minutes until fully cooked and the broccoli for 15-20 minutes until crispy and tender.
While the chicken and broccoli are roasting, prepare the quinoa according to package directions, then fluff with a fork.
Slice the rested chicken breast, plate it alongside the quinoa, and top with roasted broccoli. Drizzle any remaining pan juices over the top.
Serve warm and enjoy your balanced, nutrient-packed meal.