In a bowl, combine olive oil, oregano, garlic powder, salt, and pepper. Add the chicken breasts and coat them well with the marinade. Let it marinate for at least 30 minutes (or up to 2 hours in the refrigerator for more flavor).
Preheat a grill or skillet over medium-high heat. Cook the marinated chicken for about 6-7 minutes on each side or until the internal temperature reaches 165°F (75°C). Remove from heat and let rest for 5 minutes.
While the chicken is cooking, in a separate bowl, combine the cooked quinoa or couscous, cherry tomatoes, cucumber, red onion, kalamata olives, and lemon juice. Toss gently to combine.
Slice the grilled chicken into strips. In serving bowls, layer the quinoa or couscous mixture first, then top with sliced chicken. Crumble feta cheese over the top and sprinkle with fresh parsley for garnish.
Serve the bowls warm, drizzled with extra olive oil if desired, and enjoy this fresh Mediterranean flavor!
Notes
Marinate the chicken for longer for enhanced flavor.