What went wrong with my sweet potato?

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I have some large sweet potatoes left over from Christmas, so I decided to baked it into "chips." I peeled it and then used my Pampered Chef slicer to cut it into thin chips. I sprayed a baking pan with Pam and arranged the chips, rhen baked on 350 for twenty minutes.

They don't taste bad, but they didn't get crispy at all! Now I am the first to admit that I am a terrible cook, but this sounded pretty fool-proof. Any suggestions for next time?

Thanks!

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