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Preheat oven to 225F. Line 2 large baking sheets with parchment paper.
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Place sliced sweet potato in a large bowl. Drizzle olive oil over top; sprinkle with salt (or other seasoning). Toss the potatoes with your hands to make sure all are covered.
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Lay the sweet potatoes out in a single layer on the prepared baking sheets. Bake for about 1½ hours (may be longer), rotating the sheets halfway through. until the sweet potatoes are crispy.
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Let cool slightly. Best eaten the day they are made.