Shred the rotisserie chicken into bite-sized pieces.
Wash and dry the salad greens thoroughly.
In a large bowl, combine the mixed salad greens and shredded chicken.
Add the halved cherry tomatoes to the bowl.
Slice the cucumber and add it to the salad.
Thinly slice the red onion and toss it in.
Add the olives and crumbled feta cheese, if using.
Drizzle your choice of dressing over the salad.
Toss the salad gently to combine all ingredients evenly.
Serve immediately or chill in the fridge before serving.