How do I take ham/cheese toasties to the next level?

I make a bulk amount of ham/cheese sandwiches because they freeze well, then I chuck them in the freezer and grab them in the morning on my way out the door if I need something for lunch.

What suggestions do you have for something I could add that would take them next level?

It could be a relish, it could be a veggie, it could be a seasoning. I've been experimenting with Pepper & Me seasonings/salt mixes, but I feel like it needs something else. All ideas welcome!