Gather all your ingredients and prepare the vegetables.
Chop the mixed greens into bite-sized pieces and place them in a large salad bowl.
Add the diced cucumber, cherry tomatoes, bell pepper, and red onion to the bowl.
Incorporate the diced avocado and feta cheese.
Drizzle olive oil and lemon juice over the salad and season with salt and pepper.
Toss the salad gently to combine all the ingredients.
Taste and adjust seasonings as necessary.
Serve immediately or refrigerate for up to an hour before serving.