This sounds supper delicious....... since it is made with milk .....does the cake have to be refrigerated? how long will it be safe to keep the cake at room temp/ I am very new at this...... Thanks for any help.....
I would refridgerate a cake with this filling since it is made with milk. If you are making it ahead of time, be sure to leave off any decorations that don't need to be exposed to the moist environment of a fridge (like gumpaste)
You could try using evaporated milk. This way it would be safe to be left out. That is just a thought.
Evaporated milk, (not condensed) is sterile only as long as it is in the can. When left out, is is subject to the same conditions as regular milk. Condensed milk is a different story as the high sugar content helps deter spoilage.
I always store my cakes in the fridge when filled with anything containing fresh fruit, milk or cream. If you want it served at room temp just take it out an hour before serving, necessary if you use a ganache icing.