Preheat the oven to 375°F (190°C).
In a mixing bowl, combine the flour, baking powder, and salt.
In another bowl, whisk together the milk, egg, and Italian seasoning.
Gradually add the wet ingredients to the dry ingredients, stirring until just combined.
Fold in the mozzarella cheese and pepperoni.
Prepare a baking sheet with cooking spray or oil.
Scoop tablespoon-sized portions of the dough onto the prepared baking sheet, spacing them about 2 inches apart.
Lightly spray the tops of the dough with cooking spray.
Bake for 15-20 minutes, or until golden brown.
Remove from the oven and let cool for a few minutes before serving.