Mozzarella Sticks are an easy, classic appetizer that everybody loves! The warm melted cheese is surrounded by savory breading that keeps it from oozing out as it is fried to crispy, golden perfection.
Slice the brick of mozzarella cheese into 16 sticks that are each about 3 1/2" long.
In a shallow bowl, whisk together the eggs and milk. In a separate shallow dish like a pie plate, stir together the breadcrumbs, Parmesan cheese, and salt.
Working one at a time, dip each mozzarella stick into the egg wash, let the excess drip off, then roll in the breadcrumbs. Repeat the process for each mozzarella stick for a double coating of bread crumbs by dipping again in the egg wash and breadcrumbs before transferring to a sheet pan. Continue until all of the cheese is coated and the breadcrumbs have been used up.
Transfer the mozzarella sticks to the freezer and freeze for at least 1 hour.
Fill a large skillet at least 1"-2" deep with vegetable oil, or use a deep fryer if you have one. Heat the oil to between 350 and 365 degrees F over medium-high heat. The temperature will drop when the frozen mozzarella sticks are added, so use a thermometer to monitor the oil temp and keep it in range.
Working in batches, fry 5-6 mozzarella sticks at a time for 1-2 minutes, carefully turning with tongs halfway through, until crispy and golden brown on the outside. Remove the fried mozzarella sticks to a plate lined with paper towel to soak up any excess oil.
Continue to fry the remaining mozzarella sticks, then serve hot with marinara sauce for dipping.