In a large bowl, combine the mashed potatoes, garlic salt, pepper and cheese.
Microwave the corn tortillas until pliable. Usually about 1 minute.
Place about a 1/4 cup in the middle of a corn tortilla and slightly shape the mashed potatoes into a log. Roll the corn tortilla tightly over the mashed potatoes until it becomes a taquito.
Continue rolling and place the taquitos on a plate ready to fry.
In a frying pan, heat about 1.5 inches of oil to med high heat.
When the oil is hot, add the taquitos seam side down and fry for 3-4 minutes on each side. You can do 4-5 taquitos at the same time, just don't overcrowd the pan or they will not fry correctly.
When the taquitos are crispy, drain them on a paper towel.
Some potatoes will escape and create a "potato crumb". Use a slotted spoon and get out as much as you can, place on a paper towel to drain.
You can eat the taquitos plain or you can plate them with chili crema, salsa ranchera, lettuce, cotija cheese and the potato crumbs.