Doritos Taco Pasta Salad

Prepare the Beef:
Brown the ground beef in a large skillet, drain fat, then mix in taco seasoning according to package directions. Let cool.
Cook the Pasta:
Boil rotini pasta until al dente according to package directions. Drain, rinse with cold water, and let cool completely.
Prepare Vegetables:
Dice onion, halve tomatoes, and shred lettuce and cheese.
Combine:
In a large bowl, mix together the cooled beef, pasta, onion, tomatoes, and cheese.
Add Dressing:
Toss with French dressing until everything is well coated.
Add Crunch:
Just before serving, fold in the shredded lettuce and crushed Doritos for maximum crunch.
Serve:
Enjoy immediately! Optionally garnish with extra cheese, cilantro, or sour cream.