In a large bowl, combine the mixed greens, cherry tomatoes, cucumber slices, red onion, and diced avocado.

Sprinkle the feta cheese and toasted pine nuts over the salad.

In a small bowl, whisk together olive oil, lemon juice, salt, and pepper to make the vinaigrette.

Drizzle the vinaigrette over the salad and toss gently to combine. Serve immediately.