01 -
Bring a large pot of salted water to a rolling boil. Add the pasta and cook until al dente, according to package instructions, about 8 to 10 minutes.
02 -
Drain the cooked pasta thoroughly and rinse under cold water to halt cooking. Set aside to cool completely.
03 -
Heat olive oil in a large skillet over medium heat. Add diced onion and cook, stirring frequently, until caramelized and deeply golden brown, about 10 to 12 minutes.
04 -
In a large mixing bowl, whisk together sour cream, mayonnaise, milk, chives, garlic powder, onion powder, salt, and black pepper until smooth and well combined.
05 -
Add cooled pasta, caramelized onions, shredded cheddar cheese, and fresh parsley to the dressing. Toss until all ingredients are evenly coated.
06 -
Cover and refrigerate the salad for at least 30 minutes to allow flavors to meld. Serve chilled.