over-egg the cake
over-egg the pudding = over-egg the cake
go too far in embellishing, exaggerating or doing something.
Excessive quantities of egg in a pudding could either make it too rich or cause it not to set or cook correctly.
1998 - Spectator - This is a noble end, but in her eagerness to reach it Duffy somewhat over eggs the cake.
over-egg the cake :
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