Brown the ground beef and prepare it according to the taco-seasoning package directions.
Allow the seasoned meat to cool.
Cut the lettuce and place it in a large mixing bowl.
Add the cooled ground beef.
Crush the desired amount of Doritos and add them to the bowl.
Add the shredded cheese.
Pour in Western dressing to taste.
Mix until the ingredients are well combined and coated with dressing.
Dice the tomatoes, onions and any other desired toppings.
Add the toppings before serving.