Rinse the spring mix salad greens thoroughly under cold water to remove any dirt or debris. Pat dry and set aside in a large salad bowl.

Slice the cucumber into thin rounds and halve the cherry tomatoes, adding them to the bowl with the spring mix. If using, thinly slice red onion and toss it in.

Sprinkle the crumbled feta cheese and the chopped walnuts or pecans over the salad.

Optional: Toast the chopped walnuts or pecans in a dry skillet over medium heat for about 1-2 minutes until fragrant.

In a small bowl, combine balsamic vinegar, honey (or maple syrup), and olive oil. Whisk until well-blended.

Season the dressing with salt and pepper to taste.

Drizzle the dressing over the prepared salad just before serving and toss gently.