01 - 
                Rinse and thoroughly dry spring mix greens to prevent sogginess. Slice and quarter the cucumber, halve the cherry tomatoes, thinly slice the red onion, and drain the Kalamata olives. Crumble the feta cheese and set all aside for assembly.
              
              
              
                02 - 
                In a small bowl, combine olive oil, balsamic vinegar, Dijon mustard, garlic powder, and salt. Whisk vigorously until the dressing emulsifies into a smooth, glossy vinaigrette.
              
              
              
                03 - 
                Place the prepared greens in a large bowl. Evenly scatter cucumber, cherry tomatoes, red onion, and olives over the greens, then sprinkle the crumbled feta on top.
              
              
              
                04 - 
                Just before serving, drizzle the vinaigrette over the salad and toss gently to coat without bruising the greens. Serve immediately for optimal freshness and texture.