First, in a dry pan, toast nuts and chop them a little bit. Then add raisins. Melt chocolate and pour it on nuts and raisins, mix well. Pour the chocolate mixture in a baking pan lined with some baking paper and put it in a fridge for couple hours. Lastly, take it out from the fridge and cut in a shape you want.
Note: It's probably one of the easiest and quickest desserts. Also, you can add some dried fruits, cookies, marshmallows or other things you would like!