Preheat the air fryer to 375°F.

Core the apples and cut them crosswise into 1/3-inch rings.

Place the oat flour in one dish and beat the eggs in a second dish.

Combine the crushed cereal, cinnamon, and coconut sugar in a third dish.

Coat each apple ring in flour, egg, and then the cereal mixture.

Spray lightly with cooking spray and air-fry for 9 minutes, turning halfway through.

Mix the yogurt, maple syrup, and vanilla and serve with the warm rings.