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