Preheat your oven to 350 degrees. On a lightly floured surface, unroll the Pillsbury dough, carefully stretching into a uniform rectangle.
Beginning at one end of the rectangle, place the pepperoni slices over top of the dough, overlapping just a little bit. Leave a small strip of dough at one end without pepperoni, you'll use this as your end seam to seal the loaf.
Next, sprinkle the shredded cheese over the pepperoni. My family likes a lot of cheese, but you may find that 2 cups is enough for you.
Now you want to roll the dough to make a long log shape, beginning at the covered end and rolling to the uncovered end of the triangle.
Place the loaf, seam side down, on a rimmed baking sheet. With a serrated knife, place 3-4 cuts in the dough to vent the loaf...this is an important step...if you don't do this the loaf could break open.
Lightly spray the loaf with cooking spray. Sprinkle with grated parmesan and the Italian spices.
Bake 30-45 minutes, until golden brown. We serve this with individual cups of marinara sauce.