Baked Sweet Potatoes recipe from Mountain View Country Market in Chuckey,TennesseeBaked Sweet Potatoes

2 medium sweet potatoes (8 to 12 ounces each)
Kosher salt and freshly ground black pepper
Unsalted butter, for serving (optional)

Position an oven rack in the center of the oven and preheat to 400 degrees F. Line a rimmed baking sheet with foil, then set a wire rack inside the baking sheet. Prick each of the sweet potatoes 5 times with a fork and place on top of the prepared rack, keeping space between potatoes to allow heat to circulate. Bake the sweet potatoes until a paring knife can easily go through without resistance, about 1 hour. Turn the oven off and let the potatoes rest inside for 30 minutes more. Remove from the oven and cut each potato in half lengthwise. Season with salt and pepper and top with butter if using.