1. In a medium bowl combine shredded chicken, chopped celery, diced red onion, and diced avocado.

2. In a small bowl whisk together Greek yogurt or mayonnaise, lemon juice, salt, and pepper until smooth.

3. Pour the dressing over the chicken mixture and fold gently to combine, leaving chunks of avocado visible.

4. Lay butter lettuce leaves flat on a clean surface or platter.

5. Spoon a generous portion of the chicken salad into the center of each lettuce leaf.

6. Fold the sides of the lettuce over the filling and roll into a wrap, securing with a toothpick if desired.

7. Arrange the wraps on a serving platter and garnish with extra lemon wedges or fresh herbs.

8. Serve immediately or store chicken salad and lettuce separately until ready to assemble.