Delicate, melt-in-your-mouth French butter cookies, perfect with tea or as a sweet snack.

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Preheat oven to 350 °F (175 °C). Line baking sheets with parchment paper.
In a bowl, cream butter and powdered sugar until light and fluffy, about 2–3 minutes.
Add egg yolk and vanilla extract; beat until combined.
Gradually add flour and salt; mix on low until just combined, forming a soft dough.
Transfer dough into a piping bag fitted with a star tip and pipe 2‑inch swirls onto prepared sheets, spacing cookies about 2 in apart.
Bake for 12–15 minutes, until edges begin to lightly brown.
Allow cookies to cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.