Start by cutting the whole milk mozzarella block into sticks, about 1 inch wide and 4 inches long. Set them aside on a plate lined with parchment paper.
In three separate bowls, set up your breading station: add all-purpose flour to the first bowl, beat the eggs with milk in the second bowl, and mix panko breadcrumbs with seasonings in the third bowl.
Take each mozzarella stick, coat it in flour, dip it in the egg wash, and then roll it in the seasoned panko breadcrumbs. Repeat for all cheese sticks.
Place the breaded cheese sticks back on the parchment-lined plate and freeze them for at least 30 minutes.
In a large frying pan, heat about 2 inches of vegetable oil over medium-high heat. Test the oil with breadcrumbs; if they sizzle, it’s ready.
Carefully add the frozen cheese sticks to the hot oil in batches, frying them for about 2-3 minutes on each side or until golden brown.
Use a slotted spoon to transfer the cheese sticks to a paper towel-lined plate to drain excess oil. Serve immediately with marinara sauce for dipping.