Fill a large pot with lightly salted water and bring to a rolling boil. Stir in spiral pasta and return to a boil. Cook pasta uncovered, stirring occasionally, until tender yet firm to the bite, about 12 minutes; drain.

Meanwhile, heat a large skillet over medium-high heat; add ground beef. Cook and stir until beef is crumbly, evenly browned, and no longer pink, about 10 minutes. Drain and discard any excess grease. Stir taco seasoning into beef; cool.

Stir beef mixture into pasta. Add lettuce, tomatoes, Cheddar cheese, corn chips, onion, and French dressing; toss to combine and coat. Top with sour cream.