Fillings, and where the shelf life goes
Updated
On this page7
The shell is not a preservation system
Chocolate around a filling keeps air and handling off it and does nothing about the water inside. A ganache made with fresh cream is a high-moisture dairy product in a chocolate case, and it behaves like one.
Which puts water activity back in charge
A ganache high enough in water will support growth, so the shelf life is days to a few weeks refrigerated rather than months at room temperature. Makers who treat a filled chocolate as shelf stable because the outside is are making the mistake this page exists for.
Which is why fillings are formulated down
Higher sugar, invert sugar, a proportion of butter rather than cream, or alcohol, all reduce the available water and extend the life. That is a formulation exercise with a measurable target rather than a matter of taste, and it is what distinguishes a commercial filled chocolate from a home-made one.
Caramel and praline fillings keep far better
Because they are low in water to begin with. A maker wanting a shelf-stable filled product usually ends up here rather than with ganache, and that is a real constraint on what the range can be.
Moisture migration happens even when nothing grows
Water moves from a wetter filling into a drier shell over time, softening the shell and sometimes causing it to crack or bloom. That is a quality clock running in parallel with the safety one, and it is usually the one that limits a well-formulated product.
Date it from the filling, and say if it needs cold
If it is a refrigerated product, that belongs on the package in plain words. Printing a long ambient date because the alternative is harder to sell is the version of this that goes wrong.