Ingredients

• 1 cup (110 grams) all-purpose flour
• 1/2 cup (40 grams) hazelnut flour
• Pinch fine salt
• 7 tablespoons (100 grams) unsalted butter, softened
• 3 tablespoons (40 grams) granulated sugar
• 1 vanilla bean
• 1 large egg yolk
• Confectioners' sugar, for dusting

Instructions

1. In a small bowl, mix together the all-purpose flour, hazelnut flour and salt. Beat the butter and granulated sugar with an electric mixer on medium-high speed until creamy. Split the vanilla bean, scrape out the seeds using the back of a thin knife and add to the butter with the egg yolk. Beat until combined. Gradually mix in the flour mixture until just combined.
2. Roll the batter into a 12-inch log, wrap in plastic wrap and chill for 1 hour.
3. Preheat the oven to 350 degrees F. Line 2 baking sheets with parchment paper.
4. Cut the log into 18 pieces and roll each piece into a crescent shape. Put the crescents on the lined baking sheets, about 1 inch apart. Bake until the cookies are set and the bottoms and edges are browned, about 14 minutes. Cool on the baking sheets for a few minutes. Dust with confectioners' sugar while warm, and then transfer to a wire rack to cool completely.