Step 1: Cook the Pasta

1. In a large pot, bring salted water to a boil. Add the rotini or elbow macaroni and cook according to package instructions until al dente. Drain and rinse under cold water to cool.

Step 2: Prepare the Dressing

1. In a small bowl, whisk together the mayonnaise, Dijon mustard, apple cider vinegar, garlic powder, salt, and pepper until smooth. Set aside.

Step 3: Combine Salad Ingredients

1. In a large bowl, combine the cooked pasta, corned beef, Swiss cheese, sauerkraut, and red onion.
2. Pour the dressing over the pasta mixture and toss gently to combine.

Step 4: Chill and Serve

1. Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld.
2. Before serving, sprinkle with fresh parsley for garnish.
3. Serve chilled or at room temperature.