Season the chicken breast evenly with the sea salt, black pepper, and dried oregano.
Grill or pan-sear the chicken over medium-high heat for approximately 6-7 minutes per side until the internal temperature reaches 165°F.
While the chicken is cooking, dice the cucumber into bite-sized pieces, halve the cherry tomatoes, and finely mince the red onion.
Rinse and drain the cooked chickpeas thoroughly if using canned varieties.
In a large mixing bowl, whisk together the extra virgin olive oil, lemon juice, and chopped fresh parsley to create the dressing.
Add the cucumber, cherry tomatoes, red onion, and chickpeas to the bowl and toss well to ensure every ingredient is coated.
Once the chicken has rested for 5 minutes, slice it into thin strips or cubes and gently fold it into the salad.
Top the salad with the crumbled feta cheese and serve immediately.