Prepare the chicken: Shred your cooked chicken into bite-sized pieces and place in a large mixing bowl.
Chop the vegetables: Dice red onion, halve grape tomatoes, and chop cucumbers into small chunks.
Make the dressing: In a separate bowl, whisk together Greek yogurt, mayonnaise, red wine vinegar, lemon juice, garlic, dill, oregano, and salt until creamy and smooth.
Combine the salad: Add the olives and chopped vegetables to the bowl with the chicken. Pour the dressing over the top and gently toss until everything is evenly coated.
Chill (optional): For best flavor, refrigerate for at least 30 minutes before serving. This helps the flavors meld together.
Enjoy: When ready to serve, sprinkle with Feta cheese. Serve cold in a pita, over greens, with crackers, or as a delicious chicken salad sandwich.