In a small bowl, combine extra virgin olive oil, balsamic vinegar, Dijon mustard, garlic powder, and salt. Whisk until it’s smooth and well-blended. Set aside to let the flavors meld.

In a large bowl, add your mixed leafy greens or romaine lettuce, followed by the cucumber, cherry tomatoes, red onion, kalamata olives, and feta cheese (if using). Gently toss to combine all the fresh veggies.

Just before serving, pour the prepared vinaigrette over the salad. Toss everything together well, ensuring that each ingredient is deliciously coated in the dressing.

For a beautiful presentation, serve the salad on a flat platter.