Peel the Russet potatoes and grate them using the large holes of a box grater.
Transfer the grated potatoes to a clean kitchen towel or cheesecloth.
Squeeze out as much moisture as possible. This step is essential for achieving crispy hash browns.
Heat the olive oil in a large cast-iron skillet or heavy frying pan over medium-high heat.
Once the oil begins to shimmer, spread the grated potatoes evenly across the skillet in a layer about ¼ to ½ inch thick.
Season with salt and freshly ground black pepper.
Cook undisturbed for 5–7 minutes, allowing the bottom to become deep golden brown.
Carefully lift one edge with a spatula to check the color.
Flip the hash browns using one large spatula or divide them into sections for easier turning.
Cook for another 5–7 minutes until the second side is equally crisp and golden.
Transfer to a serving plate and serve immediately while hot and crispy.