Steps
1. In a bowl, mix olive oil, lemon juice, minced garlic, oregano, salt, and pepper.
2. Marinate the chicken breast in the mixture for at least 20 minutes.
3. Preheat a grill or grill pan to medium-high heat.
4. Grill the chicken for 5-6 minutes on each side, or until fully cooked.
5. In a separate bowl, combine cooked quinoa, cherry tomatoes, cucumber, parsley, and balsamic vinegar.
6. Season the quinoa salad with salt and pepper to taste.
7. Serve the grilled chicken alongside the quinoa salad.