01 - In a bowl, combine olive oil, lemon juice and zest, minced garlic, parsley, oregano, thyme, salt, and black pepper. Whisk until well blended.
02 - Add chicken breasts to the marinade, ensuring they are thoroughly coated. Cover and refrigerate for a minimum of 15 minutes, or ideally overnight.
03 - While the chicken marinates, bring water or chicken broth to a boil in a medium saucepan. Add rinsed quinoa, reduce heat to low, cover, and simmer for 15 minutes or until all liquid is absorbed. Remove from heat, fluff with a fork, and allow to cool.
04 - Preheat grill or grill pan to medium-high heat. Grill the marinated chicken for 6 to 7 minutes on each side, or until fully cooked and juices run clear. Transfer to a cutting board and rest for 5 minutes before slicing.
05 - In a large mixing bowl, combine cooled quinoa, cherry tomatoes, diced cucumber, chopped red onion, feta cheese if desired, parsley, and mint.
06 - In a separate small bowl, whisk together olive oil, lemon juice, Dijon mustard, minced garlic, honey, salt, and pepper until emulsified.
07 - Pour the dressing over the quinoa mixture. Toss gently to ensure all ingredients are evenly coated.
08 - Arrange the salad on a platter or in serving bowls. Top with sliced grilled chicken. Serve promptly or refrigerate for later enjoyment.