Cook the pasta until tender according to package directions, drain and quickly rinse under cold water. You can do this in batches or all at once in stock pots.

Cook the bacon until crispy, drain the grease and crumble. Slice the green onions thinly.

In a large bowl, combine the mayonnaise, sour cream, and ranch powder; stir well.

Working in separate large containers or pots, mix together the cooked and cooled pasta, crumbled bacon, and onions into equal portions. Pour an even amount of the ranch dressing mix over each batch; stir well.

Cover and refrigerate until serving, at least two hours.