In a large bowl, mix together the maple syrup, melted butter, vanilla, spices, and salt.
Add the apples to the maple syrup mixture and toss well to combine.
Preheat air fryer to 375°F. Spray the tray of your air fryer with nonstick cooking spray. Add the apples in a single layer (cook in batches if necessary). Cook for 12 to 14 minutes, tossing at least once during cook time, or until tender and golden brown around the edges.
Serve warm topped with Greek yogurt and walnuts.
Notes
Note: The macros for this recipe are calculated without Greek yogurt and chopped walnuts, which are optional.