Cut cheese sticks into long slices approximately 3/8 inch thick. Blend together the flour and cornstarch in a bowl. Place cheese plank into the flour, then dip into a bowl of whole milk and then dip the cheese stick into the breadcrumbs.
Shake off excess breadcrumbs and place mozzarella stick on a wire rack. Discard the flour. Repeat until all cheese sticks have been dipped once.
When all of the cheese sticks have been dipped once place back into milk, then into bread crumbs for the second time, and shake off the bread crumbs. Dip all cheese sticks into bread crumbs for the second time.
Preheat vegetable oil to 350 for frying. Drop cheese stick into hot oil and fry until golden brown. This should take no longer than 1 minute. Remove cheese stick from oil and place on a wire rack to cool. Serve with your favorite marinara sauce.