Grease a mini muffin pan with nonstick cooking spray.
In a large bowl, combine flour, baking powder, milk, egg, cheese, and pepperoni, stirring until completely mixed. Spoon batter into the prepared mini-muffin cups about 2/3 full.
Bake in an oven preheated to 400°F for 15-17 minutes. Serve while warm.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.