In Indonesia we would use chocolate sweetened condensed milk as well. We would also sometimes use chocolate ganache and/or melted chocolate. In the end, we would call it chocolate balls instead cookie balls 😊

Crush digestive biscuits either with rolling pin, hands, or food processor. Place crumbs in a bowl

Mix in condensed milk as much as needed – until you can shape crumbs into balls

Roll cookie balls on sprinkles