Prepare the jacket potatoes following the on pack instructions. Heat the oil in a pan and sauté the onion for 5 minutes to soften. Stir in the garlic, mixed herbs and pepperoni, and cook for 1-2 minutes, then add in the chopped tomatoes. Bring to the boil and simmer for 5 minutes until it reduces to a thick sauce and season to taste. In a separate pan melt the butter and fry the mushroom until cooked.
Split the potatoes in half and top each one with the sauce and a good handful of mozzarella. Briefly grill or bake to melt the cheese. Serve with cooked mushrooms and fresh basil on top.
Swap the pepperoni for tinned tuna for a healthier option, or customise your potato with your favourite pizza topping. For a spicy kick, add some fresh jalapeños or chilli flakes!