Technically Walter Gerber and Fritz Stettler invented the first processed cheese in Switzerland in 1911 by heating cheese up and mixing in sodium citrate. Kraft patented the process in the USA in 1916. The term "American Cheese" was later coined to refer to any processed cheese.
The American Cheese Wikipedia page is poorly written with mostly redundant information from other Wikipedia pages... it's just a commonly used word to refer to processed cheese and marketing term.
There's so much inaccurate in this, I don't even know where to start. I'll try and find the comment I made the last time this all came up, and either link or copy it here, but it was months ago, so I have no clue if I'll find it.
The short version is that "American cheese" is cheese, just processed with an emulsifier to make it more stable and melt easier.
The process wasn't german in origin, it was swiss, and even that isn't fully accurate since the process used to make the original processed cheese in the US was slightly different.
And, if you read your packages in the US, where the terminology on packaging is legally defined and limited for cheese, you can tell whether or not it has any cheese in it by the terms used.
That's the short version, and unless I find my previous mini essay, that's all the work I'm willing to do this time around, but all of this is verifiable online if anyone wants to write up their own essay on the subject
Yea, people try to get fancy with regular cheese on grilled cheese sandwiches and I hate it. Every one I've tried as soon as it cools off it gets weird and lumpy and gross. Kraft singles stay melty a lot better. Also great on egg sandwiches for the same reason. I do prefer regular cheeses on burgers though.
You didn't ask, but I'll tell you how I make a grilled cheese with normal cheese. I have never experienced "lumpy and gross", but perhaps this is left to the individual.
Choose your bread. Anything you desire. Choose your cheeses. Nothing wrong with mixing it up and using different cheeses. If you have one of the cheese platters in the house that has a variety, this is the prime time to make a grilled cheese. Butter the pan and lay down your first slice of bread (medium-low heat). Lay whatever cheese you like on the inner side of the bread (season if desired). Let the bread toast and the cheese will soften, but you can cover it to let the heat build up enough. Not too long though as you don't want moisture building up. Throw your second slice of bread on top when you want and when the bottom side meets your expectations of toasty, flip the sandwich (during the flip, I flick more butter in for the fresh breaded side to begin its toasting session). You are now faced with the toasted side. Take more cheese and place it on the toasted side. I often use parmesan or asiago (you can use any type), but do not use a lot here. When the second side is toasted to suit, flip it back on to the outer cheese side so it can melt and toast again. Then ply the second toasted side with cheese and flip when the time is right. You will have a nicely toasted cheesy side now with the second toasted cheesy side.
You can season with garlic or garlic salt or some other herb or spice you enjoy. I love making grilled cheese sandwiches like this. They seem fancier and definitely have more flavor. I also welcome any constructive criticism or suggestions to help "up" my game further as I am always looking to improve.
That's why you eat them hot. I never use "American cheese" of any variety in a grilled cheese, I almost always use cheddar, and occasionally throw in some form of jack (Monterey Jack, PepperJack, etc). The trick is to cook it on medium-low heat and cover with a lid so it thoroughly warms the sandwich, if you cook it too hot w/ the lid off, the cheese doesn't heat enough to properly melt.
Cheddar rocks for burgers, but you do need to offset the oiliness a bit, which is what the other toppings are for (mustard, ketchup, lettuce, tomato, etc). That said, I like jack cheeses way more, especially pepperjack. That spice works really well with the savory beef.
As an American, American "cheese" (including single slices, and things like spray cheese) fucking suck. Give me a good pepperjack or white cheddar on my burger, not that processed shit.
IMO the ideal thing to do for hamburgers, mac and cheese, and grilled cheeses (the three foods that I would consider using American cheese for) is this:
Half american cheese for meltiness, half gruyere or other aged flavorful cheese for flavor.
A lot of modern recipes suggest that approach and it has worked well for me.