Perhaps it’s some sort of ham and cheese sliders on sweet Hawaiian rolls? I’ve made these before and they’re delicious. The Hawaiian rolls give it a sweetness especially if you use a honey ham, and you brush them with a garlic butter and cover with foil to bake, then bake uncovered for the last ~10 min to get a slight browning on top. I suggest you try experimenting with different sauces by adding different herbs to mayo (& mustard if you like) until it fits your liking. Personally, I love to put pickle slices in my ham and cheese sliders – or pickled jalapenos if I’m feeling spicier!
It may not be the exact same thing your mom made, but trust me these are worth trying