Cook the ground beef in a large skillet over medium heat for 8–10 minutes, breaking it apart as it cooks until no pink remains.
Stir in the taco seasoning until evenly coated. Remove from heat and allow the meat to cool slightly.
In a large mixing bowl, combine the cooked rotini pasta, jalapeño pepper, tomato, corn, red bell pepper, onion, cheddar cheese, and seasoned beef.
Pour the Catalina dressing over the mixture and toss until everything is well coated.
Refrigerate for 30 minutes if desired for enhanced flavor.
Just before serving, fold in the crushed Doritos to maintain their crunch.
Garnish the Taco Pasta Salad with extra Doritos and chopped iceberg lettuce if desired.
Serve immediately and enjoy.