Season the chicken breast with 0.125 tsp sea salt, 0.125 tsp black pepper, and 0.125 tsp dried oregano.
Heat a non-stick skillet over medium-high heat and cook the chicken for 6-7 minutes per side until the internal temperature reaches 165°F.
While the chicken cooks, prepare the dressing by whisking together the extra virgin olive oil, lemon juice, and the remaining salt, pepper, and oregano in a small bowl.
In a large mixing bowl, combine the cooked quinoa, cucumber, cherry tomatoes, red onion, and parsley.
Pour the lemon-oregano dressing over the quinoa mixture and toss thoroughly to ensure even coating.
Slice the cooked chicken breast into strips and place them on top of the salad.
Finish the dish by sprinkling the crumbled feta cheese over the top before serving.