I love me a grilled cheese sandwich and I'm not picky about it, but if you want to take the time to put in the extra effort, the following recipe is the best grilled cheese you'll ever make:
If you have some fresh tomatoes on hand, this is almost as tasty and a lot easier (and not technically grilled cheese, since no grilling is involved, nor a sandwich unless you want to call it open faced):
I never understood the appeal of grilled cheese and thought it's mostly because every time I see it it's made with toast bread (???) or brioche (hard to get a decent brioche here in Poland) but I can see a variation made with what I would call bread.
https://cooking.nytimes.com/recipes/1020107-french-onion-gri...
If you have some fresh tomatoes on hand, this is almost as tasty and a lot easier (and not technically grilled cheese, since no grilling is involved, nor a sandwich unless you want to call it open faced):
https://cooking.nytimes.com/recipes/1024469-tomato-cheddar-t...
Will give it a go.