Soak corn husks in warm water for at least 30 minutes.
In a mixing bowl, combine masa harina, baking powder, and salt.
In a separate bowl, beat the vegetable shortening until fluffy.
Gradually add the masa mixture to the shortening, alternating with broth.
Mix until a soft dough forms.
Take a soaked corn husk and spread about 2 tablespoons of masa dough on it.
Add your desired filling in the center of the masa.
Fold the sides of the husk over the masa and filling, then fold up the bottom.
Repeat with remaining husks and dough.
Place tamales upright in a steamer pot and steam for about 1 hour, until masa is firm.