Hello Mia!
This seems to be a purchased product - but you could make it yourself.
Take some chocolate (if you're using chocolate that has cocoa butter, it needs to be tempered), I prefer chocolate that has vegetable fat in it.
Melt in the microwave or on a double boiler and stir until smooth.
Temper it if it's got cocoa butter, and pour it onto a baking sheet lined with nonstick paper. I would place chopped hazelnuts or almonds, chopped marshmallows etc on the paper and then pour the chocolate on top.
That would be yummy!!