I need a chocolate mousse or ganache filling recipe that doesn't need refrigerating. I have to ice the cake with buttercream and fondant so i can't put it in the refrigerator.

Do you think just a basic 1/2 cream 1/2 chocolate mix would work and be okay? I'll probably end up filling the cake and icing it 2 days before the actual eating of the cake.

My experience is that the mousse thins out when out of the fridge too long and then you layer starts to bubble and possibly slide I hope you find something!!!! Good luck!

Aside from which, mousse needs to be kept cold for food safety. OTOH, ganache is safe at room temp. OTOOH, fondant can be refrigerated, so there's that option.