In a shallow bowl, place the buttermilk.
In a second bowl, whisk the eggs.
In a third bowl, blend together the breadcrumbs, seafood seasoning, and lemon zest.
Soak the crab shells into the bowl of buttermilk for about 10 minutes.
Dip each crab shell into beaten eggs and then coat with the breadcrumb mixture.
Grease the Air Fryer Basket with cooking spray and then slide inside.
Adjust the temperature of Air Fryer to 375 °F to preheat for 5 minutes.
After preheating, arrange the crab shells into the greased Air Fryer Basket in a single layer.
Slide the basket into Air Fryer and set the time for 10 minutes.
After cooking time is finished, remove the crab shells from Air Fryer and transfer onto serving plates.
Drizzle the crab shells with melted butter and serve immediately.