Add the ground beef to a pan and season with the cumin, garlic powder, onion powder, salt, and black pepper.
Once the ground beef is cooked through drain any grease and set aside to cool.
Add the lettuce, tomatoes, onion, and cheese to a large mixing bowl.
Place the Doritos in a large zip-up bag. Use a meat mallet, rolling pin, or frying pan to break the Doritos into smaller pieces. Add the Doritos to the mixing bowl.
In a small bowl add the Ortega taco sauce and fat-free sour cream. Whisk together until combined.
Add the cooked ground beef to the salad and top with the dressing. Mix together until the dressing is well combined.