Season the chicken breast with half of the sea salt and black pepper.
Grill the chicken over medium-high heat for 6-7 minutes per side or until the internal temperature reaches 165°F.
Let the chicken rest for 5 minutes, then dice it into bite-sized pieces.
Rinse and drain the chickpeas thoroughly.
Dice the cucumber into small cubes, halve the cherry tomatoes, and finely mince the red onion.
In a small bowl, whisk together the extra virgin olive oil, fresh lemon juice, dried oregano, and the remaining salt and pepper to create the dressing.
In a large mixing bowl, combine the diced chicken, chickpeas, cucumber, tomatoes, and onion.
Pour the dressing over the salad and toss gently to ensure everything is evenly coated.
Transfer to a serving bowl and crumble the fresh feta cheese over the top before serving.