Season the chicken breast evenly on both sides with the sea salt, black pepper, and dried oregano.
Heat 0.5 tablespoon of olive oil in a skillet over medium-high heat.
Add the chicken to the skillet and cook for 6 to 7 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
Remove the chicken from the pan and let it rest for 5 minutes before slicing it into thin strips.
In a large mixing bowl, combine the mixed baby greens, cooked quinoa, sliced cucumber, halved cherry tomatoes, diced red onion, and chopped fresh parsley.
In a small jar or bowl, whisk together the remaining 0.5 tablespoon of olive oil and the fresh lemon juice to create the dressing.
Drizzle the dressing over the salad and toss gently to coat all the vegetables and quinoa.
Transfer the salad to a plate and top with the sliced lemon herb chicken.