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Heat a couple inches of vegetable oil in a large, heavy pot to 350F.
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Peel and core the apples; slice into ¼-inch thick rings.
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Whisk together the buttermilk and sugar.
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In a separate bowl, whisk together flour, cinnamon and salt.
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Toss the apple slices with the buttermilk mixture; then dredge them in the flour mixture. Return to the buttermilk and then dredge in the flour again.
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Fry the apple slices until golden and crisp; drain on paper towels. Once cool, dust the tops with powdered sugar.