01 - Boil pasta in generously salted water until al dente. 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 packet, and 1 tablespoon of milk. Add remaining 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 cherry tomatoes, bell pepper, shredded cheddar, bacon bits, green onions, and thawed peas. Mix until uniformly distributed without crushing the tomatoes.
05 - Taste the salad and adjust salt, pepper, or additional ranch seasoning as needed.
06 - Cover and refrigerate for at least 30 minutes to allow the flavors to meld. Serve chilled.