Brown hamburger in a skillet over medium heat.

Drain off any excess grease.

Add taco seasoning to the hamburger and cook according to the packet directions.

In a large saucepan or slow cooker, combine the cooked hamburger, Velveeta cheese, Fiesta nacho cheese soup, cream of celery soup, and Rotel tomatoes (drained).

Heat over low heat, stirring constantly, until all the cheese is melted and the mixture is smooth.

Stir in shredded cheddar cheese and sour cream.

Heat through until the cheddar is melted. Stir well to combine.

Serve hot with tortilla chips, vegetables, or crackers.

Optional: Add salsa or jalapeño peppers for a spicier dip.