Shred your own cheese: Pre-shredded cheese has starch to stop the shreds sticking together. This can affect how well it melts, so shred your own.
Don't overcook the shells: Cooking them for too long makes them too soft, and means they're liable to tear when you stuff them.
Don't forget the foil: Start baking them with foil, then remove it. This allows the top to get golden brown without the risk of burning.
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