I managed to save the cake!
I decided to just make the cake a trifle and set about putting it together. I managed to put too much milk in the frosting and ran out of powdered sugar, so I added cocoa powder and turned it into chocolate mint frosting. I then whipped up some cream, without sugar, to help cut Â the sweetness of the icing and the ganache, and it helped a bit.
In the end, I put a layered the bowl with cake, Â frosting, crushed mint candies, whipped cream, ganache, then I repeated the steps another time to fill the bowl.
The cake was a big hit and very tasty, someone I am married two may or may not have had two helpings.