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Preheat the air fryer to 275 degrees F / 135 degrees C.
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In a bowl, cream butter and sugar together until fluffy, then stir in the eggs and chocolate sauce. You can also use a stand mixer.
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In a separate bowl, combine flour, hot chocolate mix, and baking soda.
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Slowly add the dry ingredients to the wet ingredients, mixing until well combined.
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Line the air fryer basket with silicone baking cups and add batter until each is three-quarters of the way full.
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Air fry for 15 minutes, or until a toothpick inserted into the center of the cupcakes comes out clean.
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Allow the cupcakes to cool, then top with frosting, if desired.