Preheat air fryer. Drain sardines. Combine blackening seasoning and cornstarch, then sprinkle over drained sardines.
Gently move seasoned sardines to air fryer basket and cook for 8 minutes at 400 degrees. Smash avocado, char tortillas, and prepare mango salsa.
Combine diced mango, red bell pepper, onion, cilantro and spicy pepper. Top with fresh lime juice, honey and a pinch of salt. Toss to combine. Spread a few tablespoons of smashed avocado onto each charred tortilla.
Top with two blackened sardines. Spoon fresh mango salsa over each. Serve with lime wedges.
