Filling
Taquitos
Make the filling: To a medium pot, add the potatoes, 1 tablespoon salt, and enough water to cover. Bring to a boil over high, then turn the heat to medium-low, cover, and simmer until the potatoes are tender, 10–15 minutes.
Drain the potatoes and return them to the pot. Mash the potatoes & halfway through add the butter, lime zest, Tajín, and cornstarch, until smooth.
Stir in the corn and cheddar until evenly distributed. Season to taste with salt, then set aside.
Make the taquitos: Position a rack in the center of the oven and preheat to 425°F.
Place the tortillas on a microwave-safe plate and loosely cover with a damp paper towel. Microwave in 15-second increments until warm, 30 seconds to 1 minute total.
Working with one tortilla at a time, rub about 1 teaspoon of oil on each side of the tortilla to lightly coat. To the center of the tortilla, add a ¼ cup of filling. Roll up the tortilla tightly, tapping the filling at the ends to keep it from spilling out, and place seam-side down on a baking sheet. Repeat with the remaining tortillas and filling.Pour any remaining oil directly onto the baking sheet.
Bake the taquitos until they crisp and hold shape, about 10 minutes. Carefully flip & continue baking until fully crisp and golden, 8–10 minutes more.
Divide the taquitos among four plates. Drizzle with the crema and sprinkle with the crumbled cotija, cilantro, and more Tajín. Serve hot with lime wedges on the side if desired.
