Mozzarella sticks are best the day they are made but you can save a few for later. Store any leftover fried mozzarella sticks in the freezer. Reheat in a 450 degree oven for 4-6 minutes. A better option than reheating if you only want a few sticks at a time is to store any uncooked, breaded mozzarella sticks in the freezer. Fry directly from frozen as per the recipe directions.