Preheat the grill to medium-high heat.
Season the chicken breasts with salt and pepper.
Grill the chicken for 6-8 minutes per side or until cooked through.
Remove the chicken from the grill and let it rest for a few minutes before slicing.
In a large salad bowl, combine the mixed salad greens, cherry tomatoes, cucumber, red onion, and feta cheese.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, salt, and pepper to make the dressing.
Pour the dressing over the salad and toss well to coat.
Divide the salad into serving plates and top each plate with sliced grilled chicken.
Serve immediately and enjoy!
