Melt cacao butter and oil in a large mixing bowl over another big bowl (or sink if need be) one-third filled with boiling water. Whiz the coconut sugar in a coffee grinder to grind finely. Remove melted cacao butter and add sugar, vanilla, cocoa powder and mix until smooth. Place rice puffs in last, stirring well from the bottom up in order to coat and combine. Scrape out into a large sealable container. Using the back of a spoon, firmly press mixture down. There should be no air anywhere, except in the rice puffs! Refrigerate to set before cutting into squares with a sharp knife.