Preheat your oven to 400°F (200°C).
In a small bowl, whisk together honey, Dijon mustard, olive oil, garlic powder, onion powder, salt, and pepper.
Place the chicken breasts in a baking dish and pour the honey mustard mixture over them, ensuring they are well coated.
Bake the chicken for 25-30 minutes, or until the internal temperature reaches 165°F (75°C). Let it rest for 5 minutes before slicing.
While the chicken is baking, prepare the quinoa according to package instructions if not already cooked.
In a large bowl, combine the cooked quinoa, cherry tomatoes, cucumber, red onion, and parsley. Toss to mix well.
To serve, divide the quinoa mixture among four bowls, top with sliced chicken and avocado. Drizzle with any remaining honey mustard sauce if desired.