Instructions
Step 1: Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.
Step 2: In a large mixing bowl, beat the softened butter and powdered sugar until light and fluffy.
Step 3: Add the egg yolk and vanilla extract, mixing until fully combined.
Step 4: In a separate bowl, whisk together the flour, salt, and cornstarch.
Step 5: Gradually mix the dry ingredients into the butter mixture until a soft dough forms.
Step 6: Add the milk and mix until the dough becomes smooth and pipeable.
Step 7: Transfer the dough into a piping bag fitted with a large star tip.
Step 8: Pipe swirl shapes onto the prepared baking sheets, leaving space between each cookie.
Step 9: Bake for 12 to 15 minutes or until the edges are lightly golden.
Step 10: Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.
Storage and Reheating Tips
Store butter cookies in an airtight container at room temperature for up to 1 week. For longer storage, freeze them in a sealed container for up to 2 months. To refresh their texture, warm them in the oven at 300°F (150°C) for 3 to 4 minutes.
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