Cut the potatoes into large chunks. (You can peel the potatoes if you don’t like the texture of the skins, or leave the peels on and remove some or all of the skins after peeling.) Place in a large saucepot and cover with water. Set over high heat and bring to a boil. Boil the potatoes for 10-15 minutes, until fork-tender.: When the potatoes hit the water you should hear a steady simmer and see gentle rolling bubbles, not a violent boil. The goal here is even cooking, so large uniform chunks cook at the same rate and avoid gummy centers. A common mistake is cutting uneven pieces, which leads to some chunks overcooking while others remain firm. If you notice a few pieces breaking apart early, reduce the heat slightly to maintain a steady simmer.
Drain the potatoes. Peel off the skins (or some of the skins) if desired. Place the potatoes back in the pot. Use a potato masher to mash the potatoes. Based on your preference, you can roughly mash them, or mash them until smooth.: Covering with cold water ensures the potatoes cook evenly from the outside in, preventing mealy texture. The water level should be about an inch above the potatoes so they cook through without exposing tops to air. You will smell the faint minerality of the potato as the pot warms, and steam will begin to rise at the edges. Avoid adding salt to the water at this stage if you plan to judge seasoning later, as it can change the way the potatoes absorb flavors.
Then stir in the eggs, parmesan cheese, flour, scallions, and salt. Mix well.: Listen for an energetic but controlled boil, with consistent bubbling across the surface; that steady sound tells you the heat is high enough to cook in the expected time. Boiling too vigorously can break the pieces into fragments, creating gluey texture. Keep an eye on the pot and lower the heat if the foam becomes excessive, and skim any foam away so the water remains clear for even heat transfer.
Preheat the oven to 225 degrees F, to act as a warmer. Set a baking sheet in the oven. Set a large skillet over medium heat on the stovetop.: The right test is visual and tactile use a fork to pierce the thickest chunk, and it should slide in with little resistance and the potato should flake slightly. Overcooked potatoes will fall apart when handled, producing a watery mash; undercooked pieces will be firm and uneven. If you find some pieces cooking faster, remove them early to avoid excess water absorption which dilutes the flavor.
Add one tablespoon butter to the skillet. Use a 3 tablespoon scoop to portion out 6-8 potato cakes into the melted butter. Use the back of a spatula to smash them flat, about 1/2 – 3/4 inch thick. Fry the potato cakes for 3-5 minutes per side.: After pouring off the cooking water, give the pot a minute to let steam escape so the potatoes dry slightly. Excess moisture is the enemy of crispness, so allow the pot to sit inverted for a short moment or return the potatoes to the warm pot over low heat for a brief shake to drive off surface water. You may smell a concentrated potato aroma as the steam lifts away. A common slip is rushing to mash while potatoes are waterlogged, which produces a gluey mix.
Move the fried potato cakes to the warm oven. Repeat in small batches until all the potato mixture is gone.: Peeling now is easier because the skins slip away after boiling; the tactile memory of warm skins coming off is satisfying. Leaving some skins on will contribute rustic texture and subtle earthiness. If you remove all skins, the resulting mash becomes silkier. Avoid aggressively scraping with a knife which can remove more flesh than intended, reducing yield.
Place the potatoes back in the pot: Returning the potatoes to the original pot lets residual heat finish any slight undercooking and helps evaporate remaining moisture. You will notice the pot warming and a dry steam rising a moment after stirring. This step primes the potatoes for a controlled mash, preventing excess water from undermining the binding phase later.
Use a potato masher to mash the potatoes: Mash until you reach your preferred texture, whether roughly mashed for rustic pockets or smooth for a creamier interior. The sound changes as you work from clumps to a smooth mass a soft scraping and gentle tearing. If you overwork starchy potatoes they can become gluey, so stop once the lumps are gone or at your chosen texture point. A metal masher offers more control than a ricer for this recipe.
Stir in the eggs parmesan cheese flour scallions and salt: When you fold these ingredients in, the mixture should feel slightly tacky but not wet; the eggs and parmesan cheese bring richness and binding, while the all purpose flour gives structure. You will see the batter become cohesive and slightly glossy from the eggs. If the mixture feels too loose, add a small dusting of flour gradually. Avoid over mixing which can make the cakes tight rather than tender.
Preheat the oven to 225 degrees F to act as a warmer: A low oven keeps cooked cakes warm without further browning. You will feel a gentle dry heat when you open the door, and the baking sheet will be warm to the touch. This step lets you maintain crispness while finishing batches. Forgetting the warming oven can lead to cold, soggy cakes as you finish the skillet batches.
Set a baking sheet in the oven: Place the sheet so it is centered and ready to receive finished cakes, which prevents them from sitting on room temperature surfaces and sweating. The immediate transfer to a warm sheet preserves the crust; you will hear minimal steam when you place the cakes because the oven is low. Using a cold tray will shock the cakes and draw moisture out, softening the crust prematurely.
Set a large skillet over medium heat on the stovetop: The pan should be hot enough that a drop of water skitters across the surface, but not so hot that butter smokes. This moderate heat allows the exterior to brown slowly, creating deep color and a crisp shell while the interior gently firms. If your pan is too hot, the outside will char before the inside cooks; too cool, and the cakes will absorb fat and become greasy.
Add one tablespoon butter to the skillet: As the butter melts you will see it foam and then quiet, and that foam subsiding is your cue to add the cakes. The butter contributes nutty flavor and helps achieve even browning. If the butter begins to brown excessively, lower the heat and wipe the pan if necessary to avoid burnt notes transferring to the cakes.
Use a 3 tablespoon scoop to portion out 6 to 8 potato cakes into the melted butter: A consistent scoop size ensures uniform cooking time and predictable browning. When the batter hits the pan you will hear a gentle sizzle signifying immediate contact and searing. Crowding the pan reduces heat and results in steaming rather than frying, so work in small batches. If you notice splattering that is excessive, reduce the heat slightly to maintain control.
Use the back of a spatula to smash them flat about 1/2 to 3/4 inch thick: Flattening creates more surface area for crisping and helps the cakes set evenly through the center. You should see the edges spread and begin to firm, with the center still slightly soft. Pressing too thin will make them fragile and quick to overbrown, while too thick can leave the center underdone. Aim for that moderate thickness for the best contrast.
Fry the potato cakes for 3 to 5 minutes per side: Cook until the underside is deeply golden brown and releases easily from the pan, then flip and repeat. The sound here is key a steady, controlled sizzle without aggressive popping tells you the heat is in the right zone. The aroma will be rich and buttery with a toasty note from the cheese. Overcooking leads to a dry interior, so check visually and by touch to judge doneness.
Move the fried potato cakes to the warm oven: Transferring to the preheated baking sheet keeps them warm and lets residual heat finish setting the centers without changing the crust. You will notice the cakes remain crisp after the move, and the oven environment prevents steam from softening them. Skipping this can result in cold centers as you continue frying batches.
Repeat in small batches until all the potato mixture is gone: Working in batches preserves pan temperature and ensures each cake gets that perfect golden crust. As you continue, you will develop a rhythm and the pan will hold even heat between additions. Rushing by overloading the skillet will produce unevenly cooked cakes and a greasy finish, so be patient and maintain consistent portioning.