01 - Cook pasta according to package directions until al dente. Drain thoroughly, rinse under cold running water to stop cooking process, and transfer to a large bowl to cool completely.
02 - In a separate large mixing bowl, whisk together sour cream, mayonnaise, and ranch seasoning mix until completely smooth and well combined.
03 - Pour the creamy dressing over cooled pasta. Add shredded cheddar cheese, crumbled bacon, thawed peas, and sliced green onions. Gently fold everything together until pasta is evenly coated.
04 - Cover bowl and refrigerate for at least 1 hour, or up to overnight, to allow flavors to develop and meld together.
05 - Remove from refrigerator, give it a quick stir, and garnish with additional bacon, cheese, or green onions if desired. Serve chilled.