First, remove the mozzarella from the packages and drain well. Cut the cheese balls into thin slices and set aside.
Now place the slices of toast and spread 4 slices of it with a little butter.
Cover the buttered side with two thin slices of mozzarella and one or two slices of ham.
Put another slice of mozzarella on the ham and cover with a slice of toast without butter.
Heat a little oil in a skillet and cook the prepared toasts over medium heat until golden brown on both sides.
Arrange the mozzarella toasts and enjoy them immediately while still warm.