Air-Fried Cinnamon and Sugar Doughnuts
Ingredients:
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½ cup white sugar
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2 ½ tablespoons butter, at room temperature
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2 large egg yolks
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2 ¼ cups all-purpose flour
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1 ½ teaspoons baking powder
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1 teaspoon salt
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½ cup sour cream
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⅓ cup white sugar
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1 teaspoon cinnamon
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2 tablespoons butter, melted, or as needed