This isn't a recipe per se, but when making grilled cheese, try using Swiss or Munster cheese instead of American cheese. My experience has been that it tastes a lot better.
Anything tastes better than American cheese.
Even Kraft imitation American cheese?
I think that if you re-examine your misconception, you will find that that is not "imitation" American cheese.
No, regular american cheese contains some non-zero percentage of mild cheddar, whereas Kraft Singles don't contain any cheese at all. I believe they're made of a mixture of milk byproducts and petroleum byproducts.
but in all seriousness, iirc Kraft doesn't seem to use rennet, making its statis as chesse questionable. Whereas regular american cheese, iirc, is just ordimary mild cheddar plus an assload of additives.