Rinse 1 cup of quinoa under cold water and cook according to package instructions (usually 2 cups water for 1 cup quinoa). Once cooked, fluff with a fork and allow to cool.
In a small bowl, mix olive oil, oregano, garlic powder, salt, and pepper. Coat the chicken breasts in this mixture and let it marinate for at least 20 minutes.
Heat a grill pan or skillet over medium-high heat. Cook the marinated chicken for about 6-7 minutes on each side, or until fully cooked (internal temperature should reach 165°F). Remove from heat and let it rest before slicing.
While the chicken is resting, slice the cherry tomatoes, cucumber, and red onion. Halve the Kalamata olives as well.
In bowls, start with a base of cooked quinoa. Top with sliced chicken, cherry tomatoes, cucumber, red onion, olives, and crumbled feta cheese.
Finish with a sprinkle of fresh parsley and serve with a lemon wedge on the side for an extra zing.
Notes
Let the chicken rest before slicing for juicier results.