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Preheat the oven to 450 degrees.
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Slice a chunk off of the sides of each sweet potato to make a flat surface to cut from. This will keep the sweet potato still while you are slicing into it.
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Slice 1/2 slices width-wise. Cut them into fries from there. Don't slice them to small because they will shrink in the oven.
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Mix the spices and potato starch together.
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Coat in olive oil, then the spices and potato starch mixture. Don't salt until they come out of the oven. Salt will extract moisture and will make them soggy.
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Place a cooling rack in a sheet pan and cover with parchment paper. Top with the sweet potatoes, but don't overcrowd the pan! It's better to use two pans if your sheet pan isn't big enough.
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Bake in the oven for 20-25 minutes, or until they are cooked and the edges have darkened. Let cool for a few minutes before serving.
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While the fries are baking, make the sauce by adding all the avocado, cilantro, coconut milk, lime, and salt to a food processor and puree.
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Serve with the fries!