In a large mixing bowl, combine the shredded chicken, Greek yogurt, and Dijon mustard. Use a spatula to mix thoroughly until the chicken is well coated in the yogurt and mustard, achieving a creamy consistency.
Add the finely chopped celery, halved red grapes, and chopped walnuts to the bowl. Pour in the honey and lemon juice, then sprinkle the garlic powder, salt, and black pepper over the top. Gently stir all ingredients together until everything is evenly distributed and coated.
Place the large tortillas on a clean, flat surface. In the center of each tortilla, lay down a handful of mixed greens or spinach, creating a fresh bed for the chicken salad mixture.
Spoon a generous portion of the chicken salad mixture over the greens, ensuring not to overfill to maintain the wrap's shape. Aim for about a third of the tortilla to be filled for optimal rolling.
Fold the sides of the tortilla inward over the filling, then starting from the bottom, roll it tightly up towards the top. Ensure the filling is secured inside as you roll, creating a neat wrap.
Using a sharp knife, slice the wraps diagonally in half to make them easier to handle and eat.
Notes
Arrange the sliced wraps on a vibrant platter, and garnish them with extra halved grapes or a sprinkle of chopped walnuts for added texture and visual appeal. Serve alongside a refreshing side of seasonal fresh fruit.