Season the chicken breast evenly on both sides with sea salt, black pepper, and dried oregano.
Heat the extra virgin olive oil in a medium skillet over medium-high heat.
Place the chicken in the skillet and sear for 6 to 7 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
While the chicken is cooking, dice the cucumber, halve the cherry tomatoes, and finely mince the red onion.
Place the cooked quinoa in the bottom of a serving bowl as the base.
Once the chicken is finished, let it rest for 2 minutes before slicing it into thin strips.
Arrange the sliced chicken, diced cucumber, cherry tomatoes, red onion, and kalamata olives in sections over the quinoa.
Crumble the feta cheese over the top and drizzle the entire bowl with fresh lemon juice.
Garnish with freshly chopped parsley and serve immediately.