The only difference between chalupas and tacos is the shell I guess. Tacos are crunchy and hard, chalupas have soft, crunchy, bready shell. You bite into it and the shell is warm and thick, with a little bit of a crunch. The lettuce and tomatos are packed into it, and mine happened to have sour cream inside, as oppose to cheese. There are only like 3 Taco Bells here, and so we went pretty far just to get a chalupa. Shoot, they're good!