Add the butter, condensed milk, and egg yolk into a bowl, then mix well using an electric or hand whisk.
Gradually add the cornstarch and continue mixing until you achieve a sand-like consistency. Knead until it becomes a manageable dough.
Start forming the cookies with your hands, place them on a surface, and gently flatten the balls with a fork, just enough to mark the tines.
Place the condensed milk cookies in the air fryer at 180° for 6 minutes. Decorate with chocolate, melting it for 15 seconds in the microwave, making a small cut in the bag and start decorating.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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