Cream the butter at medium-high speed until it fluffs.
Add the rice flour one spoon at a time and continue mixing.
Incorporate the condensed milk and mix for another minute at medium speed.
Start adding the masa harina in stages. And continue mixing.
Finally add the baking powder, cinnamon, and coffee. And continue mixing.
The dough will start forming but needs liquid to a softer texture. Add the milk in stages and continue mixing for another minute.
Incorporate the finely grated dark chocolate and add more milk as needed. Mix for another minute at high speed.
Add water to a glass and drop a dollop of the tamal dough. If the masa floats, it is ready to use.
Pat dry the corn husks to remove excess water with a paper towel.
With a spoon of a wooden paddle, spread some tamal masa to the corn husk. Use the flat side.
Stuff the tamal with your choice of flavors: Dulce de leche or hazelnut chocolate spread.
Close the tamal and secure it with corn husk strips.
Place the tamales upright, cover with corn husks and a tea towel. Place the tamalera lid and cook for 1.5 hours.