Preheat your oven to 400°F (200°C).
In a small bowl, combine olive oil, lemon juice, minced garlic, parsley, dried thyme, salt, and pepper to form the marinade.
Place the chicken breast in a shallow dish and pour the marinade over it, ensuring it is evenly coated. Allow it to marinate for at least 15 minutes.
Arrange the marinated chicken on a baking sheet and roast in the preheated oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F.
While the chicken is roasting, toss the chopped broccoli with a pinch of salt and a drizzle of olive oil. Spread it on another baking sheet and roast for about 15 minutes until crispy on the edges.
Prepare the quinoa according to package directions if not already cooked.
Once the chicken and broccoli are done, slice the chicken into strips.
Assemble the bowl by layering a base of quinoa, topping it with roasted chicken slices and crispy broccoli.
Finish with an extra squeeze of lemon juice if desired, and serve warm.