Wash and thoroughly dry the mixed greens using a salad spinner if available.
Place the dried greens in a large salad bowl.
Add the halved cherry tomatoes and sliced cucumber to the bowl with the greens.
If using optional ingredients like red onion, avocado, or dried fruits, add them to the bowl.
Sprinkle the crumbled feta cheese evenly over the salad.
In a small bowl, whisk together the olive oil, fresh lemon juice, salt, and black pepper until well emulsified.
Just before serving, drizzle the dressing evenly over the salad.
Using salad tongs or two large spoons, gently toss the salad to ensure all ingredients are lightly coated with the dressing.
If using nuts or fresh herbs, sprinkle them on top after tossing.
Serve immediately as a fresh side dish to complement your main course.