When I was a child I had a scented eraser that resembled these biscuits, so maybe I've a sentimental interest in Coles Custard Creams.
Their smell is how I remember that erasers' scent. There's the same ornate design but this biscuit is larger in size.
The Custard Creams' buttery shortbread exterior encases a powder-y cream, which although sweet has something egg-like like custard.
There are two ways to eat this style of biscuit.
The first is to first dip it in tea, usually three times to achieve an optimal balance between saturation and structural integrity.
The second is to split the layers of the biscuit and place each cream-side down on one's tongue.