Besides cheese, what do you put in your grilled cheese sandwich?

I'm having a grilled cheese sandwich for lunch and thought I'd do a survey on it! What's your favorite thing to add to your grilled cheese? I've seen many variations of grilled cheese. My mother uses onions or tomatoes along with the cheese. I use sliced brick cheddar or mozzarella and put... show more I'm having a grilled cheese sandwich for lunch and thought I'd do a survey on it!

What's your favorite thing to add to your grilled cheese?

I've seen many variations of grilled cheese. My mother uses onions or tomatoes along with the cheese. I use sliced brick cheddar or mozzarella and put thinly sliced green peppers and mushrooms in mine. My husband loves hot banana peppers and green onions in his.
Update: I've seen wieners, ham, pasta sauce, sausages, and a lot of other things in a grilled cheese.

Thanks for answering! :)
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