01 -
Spread a thin layer of mayonnaise on one side of each bread slice if desired. Arrange mozzarella slices evenly over two slices, leaving a small border. Top each with a remaining bread slice to form two sandwiches.
02 -
Whisk eggs and milk in a shallow bowl until completely smooth. Season with salt and black pepper. In a separate bowl, combine flour with salt and pepper. Add panko breadcrumbs if extra crunch is desired.
03 -
Dip each sandwich fully in the egg-milk mixture, ensuring all surfaces are coated. Allow excess to drip off, then transfer to the flour mixture, coating all sides and pressing gently to adhere.
04 -
Place coated sandwiches on a parchment-lined tray and refrigerate for 20 minutes to ensure the coating sets and cheese does not leak during frying.
05 -
Pour oil into a heavy-bottomed skillet or Dutch oven until approximately 2.5 cm deep. Heat to 175°C, verifying temperature with a thermometer or by checking that a bread piece sizzles and turns golden in 30 seconds.
06 -
Using a spatula, gently lower the chilled sandwiches into the oil. Do not overcrowd the pan; fry one at a time if needed. Fry 2 minutes per side or until golden brown and crisp. Flip carefully using tongs or a spatula.
07 -
Transfer fried sandwiches to a paper towel-lined rack to drain. Let rest for 1 minute before slicing to retain cheese stretch and avoid burns.
08 -
Cut each sandwich with a sharp serrated knife: cut halfway from one side, then flip and finish from the opposite side, stopping short of cutting completely through the cheese center to preserve the molten texture.