Cook the high-protein pasta according to package directions until al dente, then drain and rinse with cold water to cool, setting it aside.

In a large bowl, whisk together Greek yogurt, lemon juice, Dijon mustard, dried dill, salt, and pepper to create the dressing.

Combine the cooled pasta, shredded chicken, cherry tomatoes, diced cucumber, thinly sliced red onion, and crumbled feta cheese in a large bowl.

Pour the prepared dressing over the pasta mixture and toss gently to ensure all ingredients are evenly coated. Serve immediately or refrigerate for later enjoyment.