01 - Cook pasta according to package instructions until al dente. Drain thoroughly and rinse under cold water to stop cooking process. Transfer to a large bowl and let cool completely.
02 - In a separate mixing bowl, whisk together sour cream, mayonnaise, and ranch seasoning mix until completely smooth and well combined.
03 - Pour the dressing over cooled pasta. Add shredded cheddar cheese, crispy bacon crumbles, thawed peas, and sliced green onions. Fold gently until all ingredients are evenly distributed.
04 - Cover the pasta salad and refrigerate for at least 1 hour, or up to overnight, to allow flavors to meld and develop.
05 - Before serving, give the salad a quick toss. Top with additional bacon, cheese, or green onions if desired. Serve chilled.