Cook orzo according to package directions until al dente, then drain and rinse with cold water.
Season chicken breast with salt, pepper, and oregano, then sauté in olive oil in a non-stick pan until golden and cooked through.
Dice the cooked chicken into bite-sized pieces and allow to cool slightly.
In a large mixing bowl, combine the cooled orzo, diced chicken, cucumbers, cherry tomatoes, and red onion.
In a small jar, whisk together the lemon juice, minced garlic, and fresh parsley to create a bright dressing.
Pour the dressing over the salad and toss thoroughly to ensure every ingredient is well-coated.
Sprinkle with crumbled feta cheese and serve immediately or chill for later.