1. Preheat oven to 350° F.
2. Slice each hot dog 2/3 of the way down lengthwise to make a pocket for the string cheese.
3. Slice each strip cheese strip in half lengthwise.
4. Place each half-strip of strip cheese into the sliced pocket of each hot dog.
5. Place each prepared hot dog into a hot dog bun.
6. Add 2 Tbsp. marinara sauce to each hot dog.
7. Top hot dogs with shredded mozzarella.
8. Top with pepperoni and/or other toppings desired.
9. Bake in a 350° F. oven for 5 – 10 minutes or until toppings are heated and cheese is melted.

Note: If you pile on lots of additional toppings,additional bake time may be needed, although putting on too many toppings runs the risk of the hot dog buns being burnt. Therefore, it is highly recommended that you limit the number of toppings to 2 or 3, to allow for quick heating time.