Cook rotini noodles according to package directions. Drain and rinse with cold water.
In a large bowl, mix the noodles, cooked beef & onion mix, taco seasoning, lettuce, cheese, green pepper, tomatoes and dressing.
Add the crushed Dorito chips over the top.
Refrigerate until ready to serve then mix in the Doritos. (If not serving right away, this will allow the Doritos from getting soggy).
Add a dollop of sour cream to the top, then sprinkle the chopped green onions before serving.
Enjoy!!