Gosh, I don't know - just 5 minutes at 350°F sounds like it shouldn't produce that extreme a reaction. All I can think is that perhaps it was HEAVILY sugared and very oily, as that combination is more likely to burn. My husband once baked me a birthday cake ("once" being the operative word) and set it on fire in the oven because he thought he'd warm it up, and it already had the icing on it, and the icing caught on fire... So it's possible the coconut was just too sugary/oily. Sorry I can't be more helpful - PJH

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