Bring a large pot of salted water to a boil and cook your chosen pasta according to the package directions until it reaches an al dente texture. Drain the pasta and rinse it under cold water to stop the cooking process and cool it down quickly before assembling the salad.
In a small mixing bowl, whisk together the mayonnaise, Greek yogurt, lemon juice, honey, salt, and black pepper. Stir until the mixture is completely smooth and well combined, then set it aside to let the flavors meld while you prepare the remaining ingredients.
Wash and chop the red apple into bite sized pieces, leave the skin on for that beautiful Christmas red color. Slice the celery thinly and cut the red grapes in half. If your walnuts are whole, give them a rough chop to ensure they are distributed evenly throughout the salad.
In a large serving bowl, combine the cooled pasta, cooked chicken, chopped apple, grapes, celery, and walnuts. Pour the prepared dressing over the top of the ingredients and toss gently with a large spoon or spatula until everything is evenly coated in the creamy sauce.
Cover the bowl with plastic wrap and refrigerate the salad for at least thirty minutes before serving. This allows the pasta to absorb some of the flavors and ensures the dish is perfectly chilled for your Christmas gathering.
