These sweet treats are called 'Snow Skin' mooncakes, and are a Chinese delicacy gifted in fancy boxes to all and sundry as part of the Mid-Autumn Festival.
Legend has it that it all began with a woman imprisoned on the moon, separated from her lover... and other contemporary stories talk of how conspiratorial notes were exchanged hidden in traditional moon cakes for some revolution or other... But these days the traditional (baked crust) moon cakes share the same dry door-stop reputation as the dry fruit-cakes that make their re-gifting rounds in the west.
This contemporary no-bake version replaces the hard baked crust with a soft fondant-ish rice-flour skin, delicate and translucent. The filling is usually a sweet lotus paste or red bean paste, but restaurants now sell these with an infinite variety of exotic and increasingly decadent flavours: chocolate cream, champagne truffle, yuzu (orange) cream - you name it.
How easy is easy? If you can roll Play-doh into a ball and stuff it in a plastic mould, you can make this. We did this at a company social recently, and even the most hesitant participants ended up having a whale of a time.
This is more of a how-to guide than a fixed recipe - fill the snow skin with whatever favourite fillings you like, and mould it with whatever you have on hand, to make your own custom version!
Gifting is as much part of the fun as eating. I also designed some simple gift boxes to be cut out of A3 (11x17") cardstock. I used my desktop (4W) laser cutter to cut and score them, but you could use my templates and cut them by hand easily. That instructable can be found here