Arrange half of the split bagels on parchment-lined baking sheet
Place bagel halves in oven until their surface dries out, around 2.5 minutes
Remove bagel halves from the oven and top each bagel half with pizza sauce, a sprinkle of salt, a sprinkle of pepper, a generous mound of cheese, and cubed pepperoni
Bake until cheese is melted and golden brown, around 10 minutes
Repeat baking steps for any remaining bagel halves