In a bowl, mix the masa harina, chicken broth, vegetable shortening, baking powder, and salt to form a smooth dough.
In a separate bowl, dissolve the achiote paste in 1 tablespoon of hot water and add it to the dough to give it a vibrant color.
In a saucepan, combine the cooked shredded chicken, tomato sauce, and chicken broth. Cook until the mixture thickens.
Cut the banana leaves into 8x8-inch squares and lightly steam them to make them pliable.
Spread a layer of the masa dough onto the center of a banana leaf square.
Add a spoonful of the chicken mixture on top of the dough.
Fold the sides of the banana leaf over the filling to form a package.
Repeat the process with the remaining ingredients to make more tamales.
Steam the tamales for approximately 1 hour or until the masa is cooked and firm.
Serve the Belizean Tamales warm and enjoy!
