
Toss diced apples with brown sugar, cinnamon, nutmeg, and lemon juice. Divide among 6 ramekins.
Combine oats, flour, brown sugar, and salt. Cut in cold butter until coarse crumbs form.
Top each cup with crumble, pressing lightly.
Air fry at 360°F for 12-15 minutes until golden and bubbling. Cool 3-4 minutes before serving.
Tip: Use cold butter and don't over-mix — those irregular chunks create the best craggy, crispy bits.
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