In a large skillet over medium heat, cook the ground beef until browned and fully cooked, about 6–7 minutes. Drain off any excess grease, then stir in the taco seasoning and water. Simmer for 3 minutes until the mixture thickens. Remove from heat and set aside to cool slightly.

While the beef cools, chop the romaine lettuce into bite-sized pieces, halve the cherry tomatoes, and thinly slice the red onion. If using, rinse and drain the corn and black beans.

In a small bowl, whisk together Catalina dressing with sour cream or ranch until smooth. This creates a tangy, creamy dressing that coats every bite perfectly.

In a large mixing bowl, combine the lettuce, cooked taco meat, tomatoes, red onion, shredded cheddar, corn, and beans. Toss gently to mix.

Right before serving, sprinkle the crushed Doritos over the top. Pour on the dressing and toss everything together until evenly coated.

Enjoy right away while the chips are still crisp and the dressing is fresh.