Pre-heat Air Fryer at 370°F (188°C). Set at 16 minutes.
In a shallow bowl, mix the dry ingredients: old-fashioned oats, all-purpose flour, brown sugar, cinnamon, nutmeg, and salt.
Add walnuts and cranberries, then mix to combine.
Add butter and press to combine with the oat mixture. Then drizzle honey. Mix until well-combined. Set aside.
Properly wash and dry the apple. Cut the top most part. Scoop out the seeds and core with a melon baller. Alternatively, a knife and spoon works for scooping out (see notes).
Lightly brush the inner and outer parts of the apple with softened butter. Then transfer to a parchment lined Air Fryer tray.
Slowly insert tray into the middle cooking chamber, near the rotisserie catch. Air Fry for 10 minutes.
After 10 minutes, remove the Air Fryer tray and place on a baking sheet. Fill the center of the apple with the oat mixture and reserve 1 teaspoon of the filling. Air Fry for 3 minutes.
See tips or notes when closing the door.
Place the remaining oat mixture on top of the apple and slightly press down to avoid spilling. Air Fry for another 3 minutes or until oat mixture is golden and crisp.
Transfer to a serving plate. Serve with vanilla ice cream and drizzle with caramel syrup.
Notes
Core the apple carefully, leaving the base intact. This creates a "cup" that holds all the filling ingredients while cooking, preventing leaks and keeping the flavors well-contained in each bite.While filling the core of the apple with the oat mixture, close the door of the Air Fryer Oven. If you do not close the door, the Air Fryer temperature might change. It’s best to close the door and manually adjust the timer as needed.Air Fryer Baked Apple is soft and tender with a crisp topping at 16 minutes. If you’re using newly stored-bought Pink Lady Apples that are fresh and crunchy, add 2 to 3 minutes in the Air Fryer for softer apples. 15 minutes in the Air Fryer will result in soft and tender apples if you’re using Gala apples that were bought 2 weeks ago or older.If you use a melon baller to remove the core, you may end up with a larger core. Chop the apples gathered from the core (without the seeds) and add to the oat mixture.If you use a knife and spoon, you may end up with a smaller core to add your filling. Use only 1 tablespoon of the oat mixture and teaspoon of honey. Lightly brush the inner and outer parts of the apple with softened butter. The back of a teaspoon works too. The apple will be fragrant and buttery.Brown sugar and 1 teaspoon of honey provided the right sweetness, mildly sweet and ideal when adding caramel syrup over the vanilla ice cream. Use 2 teaspoons of honey if you prefer the filling to be sweeter.