Step 1: Preheat your oven to 400°F (200°C).
Step 2: Line a baking sheet with parchment paper.
Step 3: Roll out your thawed puff pastry sheet to smooth out any creases.
Step 4: Evenly spread the tablespoon of Dijon or spicy mustard over the entire surface of the puff pastry.
Step 5: Place the pepperoni slices evenly over the mustard layer.
Step 6: Sprinkle the grated Parmesan or Asiago cheese evenly over the pepperoni.
Step 7: Sprinkle the Italian seasoning over the cheese layer.
Step 8: Starting from one end, carefully roll the pastry sheet up tightly into a log.
Step 9: Slice the log into approximately 1-inch thick pinwheels.
Step 10: Place the pinwheels on the prepared baking sheet and bake for about 15-20 minutes.
Step 11: Let them cool for a minute or two before serving.