Creating Cucumber and Feta Salad is straightforward if you follow these simple steps:

1. Prepare the Cucumbers: Wash the cucumbers thoroughly. Slice them in half lengthwise and then cut into half-moons.
2. Slice the Onion: Thinly slice the red onion and set aside.
3. Halve the Tomatoes: If using, halve the cherry tomatoes.
4. Combine Ingredients: In a large bowl, combine the cucumber slices, crumbled feta cheese, sliced red onion, and halved cherry tomatoes.
5. Make the Dressing: In a small bowl, whisk together the olive oil, red wine vinegar, salt, pepper, and oregano (if using).
6. Dress the Salad: Pour the dressing over the salad and gently toss to combine all the ingredients.
7. Garnish: Sprinkle the chopped parsley on top for added freshness and color.
8. Taste and Adjust: Taste the salad and adjust the seasoning if necessary.
9. Chill (Optional): For best results, let the salad chill in the refrigerator for about 10 minutes to allow the flavors to meld together.
10. Serve: Enjoy your Cucumber and Feta Salad as a refreshing side dish or a light meal!