Preheat your oven to 220℃/200℃ (430℉/390℉) and cook your fries according to packet instructions.
Spray a medium baking tray with vegetable oil.
Pour over the pizza sauce and spread evenly with a spoon or spatula.
Cover the sauce evenly with the shredded mozzarella.
10 minutes before the fries are ready, place the place the cheese, tomato, and pepperoni in the oven until the cheese is bubbling.
Salt the fries and tip into a serving bowl.
Pour the cheesy pepperoni over the fries, enjoy straight away.