In a small bowl sift together the cocoa and cornstarch before whisking into the milk mixture.
Heat milk and cream until hot (but do not boil) whisk in sugar, cocoa, cornstarch and salt, add chocolate pieces and stir until smooth. Let the mixture cool, stir well or blend if necessary before pouring into the popsicle molds, then freeze until frozen, approximately 4-5 hours or even overnight. Enjoy!
Notes
These homemade fudgy treats can be stored in the molds for up to one week. If you haven’t eaten all of them in one week (if you haven’t you have way more self-control than I do) then you will need to remove them from the molds, wrap each one individually in plastic wrap and store in a freezer bag, they will keep for up 4 weeks in the freezer. To make them creamier you should increase the proportion of cream to milk and consider adding a small amount of condensed milk to the mixture for added richness and creaminess.