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Preheat oven to 400 degrees Start by scrubbing the Idaho potatoes and peeling the sweet potato (if using). Get out your big knife. Trim the ends of each potato to square off your fries. Holding the potato firmly on its side on your cutting board, cut it lengthwise in slices about ½ inch thick. Keeping the potato slices intact, turn the Idaho so it’s flat on the board and make the same ½ inch slices. Now you should have pretty even looking slices ready to bake. Place the potatoes on a large baking sheet or pan and mix thoroughly with the olive oil. Place in the oven and bake for about 40 minutes. Reset the oven to medium broil to make sure the tops of the fries brown nicely for another 5 minutes. Remove from the oven, and sprinkle fries with kosher salt and freshly ground pepper. Carefully but firmly loosen the fries from the bottom of the pan. Serve hot.