Step 1

Mix the cucumber, peppers, tomatoes, and onion in a large salad bowl. Set aside.

Step 2

Add the garlic, oregano, mustard, vinegar, salt, and pepper to a small bowl. Whisk vigorously to combine. Continue to whisk while slowly adding the olive oil.

Step 3

Pour the vinaigrette over the salad mixture. Then, add the feta cheese and olives. Toss everything lightly to coat in the vinaigrette. Allow the salad to rest for 30 minutes so the flavors can meld.

Step 4

Serve at room temperature and enjoy!