am trying to bake for my DDs first birthday party tomorrow, and my cupcakes have gone wrong! they looked beautiful in the oven, but since taking them out, they have come away from the paper cases, and seem to have sunk a bit. the top is quite hard (not soft like fairy cakes) and instead of having a flat surface some of them are somewhat sloping 
so please tell me what i did wrong? did i cook them too long or too low temp(not overly brown), beat the mixture for too long (used KA)? or am i just crap at baking. i think thats probably it. i so want to be a domestic goddess and it goes wrong every time
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lastly how do i fix - would buttercream and sprinkles disguise or are they destined for the bin?