Oaxacan tamales filled with chepil herb and wrapped in banana leaves offer an earthy, aromatic flavor. This vegetarian option is a fresh, healthy choice rich in traditional Oaxacan cuisine.
Soak banana leaves in hot water for 10 minutes to soften; pat dry and set aside.
In a mixing bowl, combine masa harina, baking powder, and salt. Gradually stir in vegetable broth until a soft dough forms.
Mix vegetable oil into the dough, kneading until smooth and pliable. Fold in chopped chepil leaves until evenly distributed.
Cut banana leaves into rectangles about 10x8 inches. Spread 1/2 cup masa mixture in the center of each leaf, leaving space on all sides.
Fold the banana leaves around the masa to form secure packets, tucking ends underneath. Arrange tamales vertically in a steamer basket and steam over simmering water for 75-90 minutes, checking water level occasionally.
Remove tamales from the steamer and let rest for 10 minutes before unwrapping and serving.