Cook the protein-enriched pasta in boiling salted water according to package directions until al dente.
Drain the pasta and rinse under cold water to stop the cooking process and cool completely.
In a large mixing bowl, combine the Greek yogurt, light mayonnaise, lemon juice, chopped dill, and garlic powder; whisk until smooth.
Add the cooled pasta, diced chicken breast, celery, red onion, and cucumber to the dressing bowl.
Fold all ingredients together using a spatula until the dressing is distributed uniformly.
Season with salt and pepper to taste.
Cover and refrigerate for a minimum of 30 minutes before serving to allow flavors to develop and temperature to stabilize.