Season the chicken breast evenly on both sides with sea salt, black pepper, and dried oregano.
Heat half of the extra virgin olive oil in a medium skillet over medium-high heat.
Add the chicken to the skillet and sear for 6 to 7 minutes per side until golden brown and the internal temperature reaches 165 degrees Fahrenheit.
While the chicken is cooking, whisk together the remaining olive oil, lemon juice, and minced garlic in a large mixing bowl to create the dressing.
Add the cooked quinoa, diced cucumber, halved cherry tomatoes, and chopped fresh parsley to the bowl with the dressing.
Toss the salad ingredients thoroughly until everything is well-coated and vibrant.
Once the chicken is finished, let it rest for 3 minutes before slicing it into thin strips.
Place the quinoa salad in a serving bowl and top with the sliced lemon-herb chicken.