Remove the mozzarella sticks from their wrappers. Place them on a wax-paper-lined platter and freeze for at least four hours, and preferably overnight.
6 sticks part-skim mozzarella
Preheat the oven to 400°F. Line a rimmed baking sheet with high-heat-resistant parchment paper.
Wrap each cheese stick in a prosciutto slice. As you wrap it around, the edges of the prosciutto will stick to each other so that it’s fairly neatly wrapped around the cheese.
6 slices prosciutto
Place the wrapped mozzarella sticks, seam side down, on the prepared baking sheet.
Bake until the cheese just starts to melt, for about 5 minutes. See notes below.
Serve hot or at room temperature.
Video
Notes
Please avoid using low-fat mozzarella.
Prosciutto is typically sliced very thinly, so some of the pieces might tear as you remove them from the package. Don't worry about it - those torn pieces are the chef's bonus - but it might be a good idea to get two packages, just in case. I find it easier to separate the slices if I remove the prosciutto to the counter 30 minutes before making the recipe.
If the cheese has spent an entire night in the freezer, it might need longer than 5 minutes in the oven to start melting - sometimes as long as 10 or even 15 minutes. But you should start checking after 5 minutes, just in case.
Please don't skip freezing the cheese. If the cheese is not completely frozen, it will quickly melt while baking, and you'll have cheesy puddles instead of a tasty snack.
You can keep the leftovers in an airtight container in the fridge for up to 5 days. Enjoy them cold, or reheat them very briefly, just a few seconds in the microwave.