Cook the rotini pasta according to package instructions until al dente, about 9-11 minutes. Drain and rinse under cold water.
In a large skillet over medium heat, cook ground beef until browned, about 8-10 minutes. Add taco seasoning and stir to coat the meat evenly. Remove from heat and let cool slightly.
In a large mixing bowl, combine the cooled rotini pasta, seasoned ground beef, halved cherry tomatoes, sliced green onions, sharp cheddar cheese, Monterey Jack cheese, and Catalina dressing. Stir gently to combine.
Cover the bowl and refrigerate for at least 4 hours to allow flavors to meld.
Just before serving, add crushed nacho cheese Doritos and fresh cilantro, if desired, and mix gently.
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Notes
This salad can be served as a refreshing side or a hearty main course!