Cook the pasta according to the package instructions until al dente. Drain the pasta, rinse it under cold water to stop the cooking, and let it cool completely.
In a bowl, whisk together the ingredients for the Ranch salad dressing until well combined. Set aside.
1/2 cup mayonnaise, 1/3 cup sour cream, or plain Greek yogurt, 3 Tbsp whole milk, or half and half creamer, 3 Tbsp Ranch powder, ½ tsp salt, ½ tsp ground black pepper
While the pasta cools, prepare the remaining pasta salad ingredients. Dice the cooked chicken, cook the bacon bits, halve the tomatoes, dice the cucumbers, and chop the green onions.
In a large salad bowl, add the cooked pasta, cubed chicken, bacon bits, shredded cheese, tomatoes, cucumbers, and green onions.
10 oz short pasta, cooked and cooled, 1 1/2 cups cooked chicken, cubed, 8 oz cooked bacon, chopped, 1 1/2 cups cherry tomatoes, halved, 1 1/2 cups cucumber, sliced, 3 Tbsp fresh green onion, finely chopped, 1/2 cup shredded colby jack cheese, or cheddar cheese
Pour the Ranch dressing over the pasta salad and gently toss until everything is evenly coated.
If desired, top with additional green onions, shredded cheese, and bacon bits. Serve immediately or refrigerate until ready to serve.