What is the quintessential American sandwich? I can think of a few candidates..
Bologna and American cheese on white bread with yellow mustard and mayonnaise. Mayo optional. For bonus points use Oscar Meyer Bologna, Kraft Singles, Wonderbread, Frenches mustard and Miracle Whip. Substitute Gouldens mustard if you’re feeling “spicy.” Just about everyone I know grew up eating this sandwich in their school lunchbox. It’s simple and easy to make, so it’s the perfect food to make for your kids.
Peanut butter and marshmallow fluff on white bread. Another American lunchbox classic, but many parents won’t feed it to their kids regularly because of the high amount of sugar. But the sugar count does scream, “American!”
Philly cheese steak. You can find this sandwich just about every place that makes sandwiches, but there are many variations (the real one is made from cheese whiz). Might be slightly too “regional” to be all-American tho.