Shred the potatoes: Using the large holes of a box grater, shred the potatoes.
2 large russet potatoes
Soak the potatoes: Immediately transfer the shredded potatoes to a large bowl of ice-cold water to prevent browning and help remove excess starch. Soak for just about 5 minutes. Start Timer
Rinse and dry: Pass the potato shavings through a sieve to rinse and then put them in a clean kitchen towel or cheesecloth to squeeze out moisture. The potatoes should feel dry but still slightly tacky, not bone dry. We need some moisture/starch to help the potatoes stick together, but still on the dry side for a crispy hash brown. If needed, take another clean towel to pat them dry a bit.
Season the potatoes: Place the dried potatoes in a large bowl and add the salt, pepper, garlic powder, onion powder, and cornstarch. Toss until evenly combined, and the cornstarch coats the potatoes.
1 tsp. kosher salt, 1 tsp. black pepper, 1/2 tsp. garlic powder, 1/2 tsp. onion powder, 1/4 cup cornstarch, 2 large russet potatoes
Heat the skillet: Heat a 10-inch non-stick skillet over medium heat. Add the oil and heat until shimmering. Add the potato mixture in an even layer and press down firmly with a spatula to form a compact pancake.
3 Tbsp. neutral oil
Cook the first side: Cook undisturbed for ~8-12 minutes Start Timer until the bottom is deeply golden and crispy. Avoid rushing this step. Cooking too quickly can leave the inside undercooked, and be sure to keep the heat on medium heat.
Flip the hash browns: Carefully loosen the edges with a spatula. Place a plate or cutting board over the skillet and carefully flip the hash brown pancake onto it. Return the skillet to the heat and slide the hash browns back into the pan, crispy side up. Add the butter around the perimeter of the potatoes, and allow it to melt.
2 Tbsp. unsalted butter
Cook the second side: Cook for another ~8-10 minutes, until the second side is golden brown and crispy. Start Timer
Serve: Transfer the hash browns to a cutting board or platter and slice like a pizza. Garnish with fresh herbs and parmesan and serve immediately.
Parmesan cheese, Fresh chopped parsley, scallions, or thyme