Preheat the oven to 400 degrees.

On a baking sheet lined with aluminum foil, arrange the bagel halves sliced side up.

Add your desired amount of marinara sauce, shredded cheese, and pepperoni on top.

Bake for 15 minutes or until the bagels are slightly crisp and the cheese is melted.

Let cool slightly before eating.

If you want to freeze some, bake them first and allow them to cool. Place them in a sealed container or storage bag and reheat them in the oven when ready to eat.