01 - Prepare pasta according to package directions until al dente. Drain thoroughly, rinse under cold running water to halt cooking and remove excess starch. Transfer to a large bowl and allow to cool completely.
02 - In a separate mixing bowl, whisk together sour cream, mayonnaise, and ranch seasoning packet until completely smooth and well combined. Set aside.
03 - Pour the prepared dressing over cooled pasta. Add shredded sharp cheddar cheese, crumbled bacon, thawed peas, and sliced green onions. Gently fold everything together until evenly distributed.
04 - Cover the bowl and refrigerate for at least 1 hour, or up to overnight, to allow flavors to fully develop and merge. The salad tastes best when served chilled.
05 - Before serving, sprinkle generously with additional crumbled bacon, shredded cheddar, and sliced green onions if desired. Serve cold as a side dish.