Preheat the air fryer to 350°F (175°C). Grease 2 individual ramekins.
Combine chocolate chips and butter in a microwave-safe bowl. Microwave on high for 1 minute. Stir and microwave at 15-second intervals until almost melted. Remove and stir until completely melted and combined.
Mix powdered sugar, egg, egg yolk, vanilla, salt, and flour into the melted chocolate. Whisk until combined.
Pour batter into prepared ramekins and place them into the air fryer basket. Cover with large foil pieces, folding ends under.
Cook for 8 to 10 minutes. Remove foil and cook until edges are set, 2 to 4 more minutes.
Remove from air fryer and let sit for 5 minutes. Invert onto dessert plates and serve hot.
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