Mix the bread crumbs and garlic salt in a medium bowl. In a medium bowl, blend the flour and cornstarch.
In a large heavy saucepan, heat the oil to 365 degrees F (185 degrees C).
One at a time, coat each mozzarella stick in the flour mixture, then the egg mixture, then in the bread crumbs and finally into the oil. Fry until golden brown, about 30 seconds.