Cut both ends off of the jicama, and peel all of the brown skin away. Cut the white flesh into ½-inch thick fry shapes (1.27 cm).
Put the sticks of jicama in a bowl and drizzle with olive oil. Stir gently to coat with the oil.
Mist an air fryer baking tray with the cooking oil spray. Spread the raw jicama fries in a single layer on the tray.
Put the tray in the top rack of the air fryer oven and bake for 10 minutes at 400°F (200°C). Then flip the fries over, mist them with the cooking spray oil, and bake at 400°F (200°C) on the top rack for an additional 10 minutes.
While the fries cook, whisk the yogurt, cilantro, lime juice, and lime zest together. Refrigerate this cilantro-lime dipping sauce while you finish the fries.
Pull the fries that have finished cooking off the tray. Since jicamas are not shaped like a rectangular block, some fries will naturally be smaller (and cook faster) than others.
Flip the fries left on the tray that are not done. Mist them with the cooking oil spray, and bake at 400°F (200°C) on the top rack for 5 more minutes.
When done, sprinkle your fries liberally with the tajin.
Drizzle the fries with the cilantro-lime dipping sauce (or use it as a dip).
Sprinkling on even more tajin might not be a bad idea! You could also add a squeeze of lime juice, if desired. YUM!