Bring a large pot of salted water to a boil. Cook rotini pasta in boiling water for 8-10 minutes until al dente. Drain and rinse under cold water.

In a large skillet over medium-high heat, brown the ground beef, breaking it apart, for about 5-7 minutes. Drain excess grease, then add taco seasoning and a splash of water. Cook for another 2-3 minutes.

In a large bowl, combine drained rotini pasta, seasoned ground beef, cherry tomatoes, green onions, and shredded cheese. Toss gently until mixed.

Pour Catalina dressing over the salad and fold gently until well-coated.

Cover and refrigerate for 15-20 minutes to meld flavors. Fold in crushed Doritos just before serving.