Prepare the Ingredients: Cook bacon until crispy, crumble it. Chop chicken into bite-sized chunks, dice avocado, halve grape tomatoes, and chop celery.
Combine the Base Ingredients: In a large bowl, mix chicken, bacon, green onions, parsley, tomatoes, and celery until evenly distributed.
Create the Dressing: Whisk together mayo, Greek yogurt, lemon juice, salt, and pepper until smooth.
Mix Everything Together: Pour dressing over chicken mixture and fold gently until coated.
Assemble Your Wraps: Spoon chicken salad mixture onto individual romaine lettuce leaves.
Serve Immediately or Chill: Enjoy right away or refrigerate for up to an hour before serving.