<ol>
<li>Season the chicken breasts with salt, pepper, and 1 tablespoon olive oil. Set aside for 10-15 minutes.</li>
<li>Preheat a grill or grill pan over medium heat. Grill the chicken breasts for 6-7 minutes per side or until fully cooked. Remove from heat and let it rest for 5 minutes before slicing.</li>
<li>In a large bowl, combine mixed greens, cucumber, cherry tomatoes, red onion, black olives, and feta cheese.</li>
<li>In a small bowl, whisk together 1 tbsp olive oil, lemon juice, and balsamic vinegar.</li>
<li>Top the salad with grilled chicken slices, drizzle with the dressing, and toss lightly to coat. Serve immediately.</li>
</ol>