In a mixing bowl, combine masa harina, baking powder, and salt. Add warm water and mix until a dough forms.
Divide the dough into 8 equal portions and form into balls. Flatten each ball to about ¼ inch thickness.
Heat oil in a deep skillet over medium-high heat. Fry each dough disc until puffy and golden brown, about 2 minutes per side.
Remove the fried tortillas and drain on paper towels.
Top each tortilla with shredded chicken, tomatoes, onions, cilantro, avocado, pickled red onion, and jalapeños.
Serve immediately with lime wedges on the side.
