Rinse and dry the spring mix salad greens thoroughly under cold water.

Combine the dried greens, halved cherry tomatoes, chopped cucumber, and sliced red onion in a large salad bowl.

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

Whisk together balsamic vinegar, honey, and olive oil in a small bowl or jar, season with salt and pepper.

Drizzle the dressing over the combined salad ingredients and toss gently to coat.