I don't like using Cheese Whiz in casseroles, so I wouldn't make this until my sister-in-law served it one night. No Cheese Whiz, just real cheddar cheese. Delicious, and kid-friendly.
Layer it on, then grab hold and the great meaty taste that rivals the deli. Mayo, fresh veggie add-ons and a better-for-you attitude make this sammy a lunchtime hero.