Wash and dry the mixed greens thoroughly.
In a large bowl, combine the mixed greens, sliced cucumber, and halved cherry tomatoes.
Flake the cooked salmon into bite-sized pieces and add to the bowl.
Add the diced avocado gently to avoid mashing.
In a small bowl, whisk together olive oil, lemon juice, salt, and pepper.
Drizzle the dressing over the salad ingredients.
Toss the salad gently to combine all ingredients well.
Sprinkle fresh herbs over the top for added flavor.
If desired, add crumbled feta cheese for extra taste.
Serve immediately for the freshest flavor.