01 - Boil pasta in salted water according to package directions until al dente. Drain and rinse under cold running water to halt cooking, then set aside to cool completely.
02 - In a large mixing bowl, whisk together mayonnaise, sour cream, ranch seasoning packet, and 1 tablespoon of milk. Add additional milk as needed to reach a pourable consistency.
03 - Add the cooled pasta to the dressing and toss thoroughly until every piece is evenly coated.
04 - Gently fold in the halved cherry tomatoes, diced bell pepper, shredded cheddar, bacon bits, sliced green onions, and thawed peas.
05 - Mix until all components are evenly distributed. Taste and adjust seasoning as needed before chilling.
06 - Cover and refrigerate for at least 30 minutes to allow flavors to meld before serving.