For best results, freeze the mozzarella sticks for 15-20 minutes before breading. This helps the cheese stay solid longer during frying, reducing the chance of leakage.
Maintain a shallow oil depth of about 1/4 inch. Deep frying can cause the cheese to burst more easily due to rapid heat transfer. Keep the heat moderate; if the oil is too hot, the outside will burn before the inside melts.
Serve immediately while hot and crispy. Leftovers can be reheated in an oven or air fryer at 375°F for 5-7 minutes to restore crispiness, though the texture may not be identical to fresh.