Wash all vegetables thoroughly under cold water.
In a large bowl, combine the mixed greens.
Add the halved cherry tomatoes on top of the greens.
Slice the cucumber and add it to the bowl.
Incorporate the black and green olives into the mixture.
Cube the mozzarella cheese and sprinkle it over the salad.
Thinly slice the red onion and add to the salad.
Drizzle olive oil and balsamic vinegar over the top.
Season with salt and pepper to taste.
Toss the salad gently to combine all ingredients evenly.