Take steak out of the fridge. Pat dry with a paper towel. Rub 1 tablespoon oil all over steak. Season steak with a generous amount of kosher salt and pepper on both sides. Set aside while you make the potato chips so the steak can come to room temperature before cooking.
Heat a cast iron skillet over medium-high heat. Cook steaks for 3 minutes without moving. Flip over and cook 3 more minutes for medium, more or less depending how you prefer your steak. Remove steaks to a plate and tent with aluminum foil. Let rest for 10 minutes before serving. Garnish with parsley.
Potato Chips
Wash potatoes and dry with paper towels. Use a food processor or some type of kitchen appliance to slice potatoes very thinly. I used the thin slicing attachment on my KitchenAid mixer.
Fill a large pot with 2-3 inches of oil. Heat over medium high heat until oil reaches 300 degrees. (Try to keep the oil temperature between 300 and 350 while frying chips.)
Use a spider to lower about 10 potato slices into the oil. Swirl the spider once so they are not sticking to each other. Cook for 3-4 minutes, until potatoes are a nice golden brown. Use the spider to remove chips to a paper towel lined plate or sheet pan. Sprinkle with salt or other desired seasonings immediately. Salt sticks best when the chips are still hot from the oil.
Continue frying potato slices in batches until you run out of potatoes or have the amount of chips you want.
When you are done frying the potato chips, cook the steak. Serve immediately after steak is done resting.