These pepperoni and cheese stuffed meatballs are a delicious twist on traditional meatballs. To make these meatballs, you will need ground beef, Italian seasoning, bread crumbs, an egg, shredded mozzarella cheese, and sliced pepperoni. Preheat your oven to 375 degrees F. In a mixing bowl, combine the ground beef, Italian seasoning, bread crumbs, and egg until well blended. Form the mixture into meatballs. Press a small piece of shredded mozzarella cheese and a slice of pepperoni into the center of each meatball. Place the meatballs on a baking sheet and bake for 20-25 minutes or until cooked through. Serve hot.