Soak corn husks in warm water for at least 30 minutes.
In a bowl, mix masa harina, baking powder, and salt.
In another bowl, beat the vegetable shortening until fluffy.
Add the masa mixture and chicken broth to the shortening, mixing until smooth.
Spread a spoonful of masa onto the center of a corn husk.
Add your desired filling on top of the masa.
Fold the sides of the husk over the masa and filling.
Wrap the bottom of the husk up to secure the tamale.
Place tamales upright in a steamer pot.
Steam for about 1.5 hours, or until masa is firm and fully cooked.