Season the chicken breast evenly on both sides with sea salt, black pepper, and dried oregano.
Heat a non-stick skillet over medium-high heat and cook the chicken for 5-6 minutes per side until the internal temperature reaches 165°F.
While the chicken cooks, dice the cucumber and halve the cherry tomatoes.
In a small bowl, whisk together the extra virgin olive oil and fresh lemon juice to create the dressing.
In a large meal prep container or bowl, combine the cooked quinoa, diced cucumber, cherry tomatoes, and chopped fresh parsley.
Once the chicken has rested for 3 minutes, slice it into bite-sized strips and add it to the quinoa mixture.
Drizzle the lemon dressing over the salad and toss gently to combine.
Top with crumbled feta cheese before serving or storing for later.