Begin by scrubbing the Yukon Gold potatoes under cold running water to remove any dirt. Dry them thoroughly with a towel. Cut the potatoes into 1/4-inch by 1/4-inch batons, making sure to square off the sides for even cooking.
Soak the cut potatoes in a bowl of cold water for at least 30 minutes to remove excess starch. This step is crucial for achieving crispy fries. After soaking, drain the potatoes and pat them dry with paper towels.
In a heavy-bottomed pot or Dutch oven, heat the peanut oil over medium-high heat until it reaches 325°F (163°C). Use a thermometer to check the temperature, as it is key to getting the fries just right.
Working in batches, carefully add a handful of potato batons to the hot oil. Fry for about 4 to 5 minutes, or until the fries are tender but not browned. Remove the fries with a slotted spoon and transfer them to a paper towel-lined plate to drain.
Raise the heat to 375°F (190°C). This higher temperature will give your fries that signature crisp.
Once the oil is hot, add the par-fried potatoes back to the pot in batches. Fry for an additional 3 to 4 minutes, or until they are golden brown and crispy. Remove them from the oil and place them on a paper towel to drain.
While the fries are still hot, sprinkle with salt and any additional seasonings you desire. Serve immediately for the best texture and flavor.