Large cart-style tamales sold by street vendors are a comforting, portable Mexican staple. This family-friendly, protein-rich dish is a fresh, traditional option for on-the-go meals.
Soak corn husks in very warm water for 30 minutes to soften, then drain and pat dry.
Combine masa harina, baking powder, salt, butter, and chicken broth in a large bowl; mix until a soft, spreadable dough forms.
Prepare the shredded chicken by tossing it with chili powder and cumin for even seasoning.
Spread a portion of masa dough onto each corn husk, keeping a 1-inch border from the edges, then add seasoned chicken in the center.
Fold the sides of the husk over the filling tightly, then fold the narrow end up; arrange tamales upright in a steamer basket.
Steam tamales for 90 minutes over medium heat, checking water level every 30 minutes and refilling as needed to maintain even steam.
Rest tamales for 10 minutes after steaming; serve hot for best texture and flavor retention.