using an electric mixer, beat the mousse powder with the milk as per directions on packet.
fill each cone with mousse layering with some peppermint crisp if desired.
refrigerate for 1 hour.
whip the cream with the icing sugar. pipe or spoon the cream onto the cones.
top with sprinkles.
keep refrigerated until needed.
NOTE;the mousse powder I used may not be the same as you can get. (I'm in Australia, I used "äeroplane" mousse mix ) so just follow the directions on the packets you get or you can just make your own mousse if you prefer.