<ul>
<li>2 boneless, skinless chicken breasts</li>
<li>4 cups mixed greens (lettuce, spinach, arugula)</li>
<li>1 cucumber, sliced</li>
<li>1 cup cherry tomatoes, halved</li>
<li>1/4 cup red onion, thinly sliced</li>
<li>1/4 cup feta cheese, crumbled</li>
<li>1/4 cup black olives</li>
<li>2 tbsp olive oil (for grilling)</li>
<li>Salt and pepper (to taste)</li>
<li>1 tbsp lemon juice</li>
<li>1 tbsp balsamic vinegar (for dressing)</li>
</ul>