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For 2 minutes, preheat the air fryer to 180C/356F.
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Mix the melted butter and vanilla extract in a small bowl.
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Then, add the raw walnuts to the butter mixture and thoroughly combine everything.
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Brown sugar, cinnamon powder, and salt should be placed in another small mixing bowl. Then, mix them thoroughly.
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Add the sugar mixture on top of the walnuts, and blend everything thoroughly.
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Put the walnut mixture in the air fryer basket and cook for 8 minutes at 180C /356F. Toss them halfway through the cooking process.
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Before serving, remove the candied walnuts from the air fryer and allow them to cool fully.
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Serve and enjoy.