Season the chicken breast evenly on both sides with the sea salt, black pepper, and dried oregano.
Heat a medium skillet over medium-high heat with half of the olive oil.
Add the chicken to the skillet and cook for 6-7 minutes per side, or until the internal temperature reaches 165°F.
Remove the chicken from the pan and let it rest for 5 minutes before slicing into bite-sized cubes.
While the chicken rests, mince the garlic and dice the cucumber and cherry tomatoes.
In a large mixing bowl, whisk together the remaining olive oil, lemon juice, and minced garlic to create the dressing.
Add the cooked quinoa, diced cucumber, cherry tomatoes, and chopped parsley to the bowl with the dressing.
Toss the salad ingredients until thoroughly coated, then fold in the sliced chicken and serve immediately.