Preheat the oven to 350 degrees.
Take one biscuit and flatten it out, put a bit of mozzerella cheese on top (I do a pinch and judge from there), then 2-3 pepperoni slices. Then roll up the biscuit into a cresent roll shape, place it on a cookie sheet. If you use all 4 cans of biscuits, this will make about 40 pepperoni rolls. Cook these for about 12-15 minutes. When the bottoms turn brown they are done.