You don't need any fancy ingredients for it — just bread, tomato sauce, cheese, pepperoni, and butter.
Traditionally, a mountain pie is made in a camp cooker or a square pie iron, which is a long, square-shaped cast iron cooker with a handle and a lid. I don't have that — so I just used my regular cast iron skillet on the stovetop.
First, coat two slices of bread in softened butter. Place them butter-side-down in a cast-iron skillet (or pie iron).
Next, the toppings: a layer of tomato sauce, shredded cheese, pepperoni, and finally more shredded cheese on top.
Now, add the second slice of bread but make sure to place it butter side up so that when you flip the sandwich, the butter is directly touching the skillet.
Transfer your creation to a plate, slice it in half (or don't), and try not to devour it in under five seconds. Be warned: this is the hardest part.
This sandwich might be the ultimate comfort food. It's saucy, it's savory, it's incredibly cheesy, and it's slightly spicy thanks to pepperoni.
Best of all, you can make it in about seven minutes flat with very basic and affordable ingredients. It's incredibly simple, yet super delicious.