Preheat your oven to 400 degrees f. and line a large baking sheet with parchment paper.
Cut the mini peppers in half lengthways through the stems. Gently scrape the seeds out, keeping the stems on.
Arrange your pepper halves, cut side up, onto the prepared baking pan.
Spoon a tiny bit of tomato sauce into each one, then sprinkle with shredded mozzarella.
Top with pepperoni and place the tray into the hot oven.
Bake for 10 minutes, or until the cheese is nice and melty.
Sprinkle with chopped parsley if desired.
Serve immediately and enjoy!