01 - Gently melt the butter with the whole milk in a small saucepan over low heat. Add the sugar and vanilla seeds scraped from the pod, stirring continuously until the sugar has fully dissolved and the mixture is smooth.
02 - Remove the saucepan from heat and allow the mixture to cool slightly until lukewarm, then transfer it to a large mixing bowl.
03 - Sift the flour and baking powder directly into the bowl. Add the pinch of salt, then stir with a wooden spoon or spatula until a smooth, homogeneous dough forms and no dry pockets remain.
04 - Shape the dough into a tight ball, wrap it securely in plastic wrap, and refrigerate for at least 1 hour to firm up and develop structure.
05 - Preheat the oven to 350°F (180°C) using conventional bake setting. Line a baking sheet with parchment paper and set aside.
06 - Lightly flour a clean work surface. Roll the chilled dough out evenly to a thickness of about ⅛ inch (3–4 mm), rotating it occasionally to prevent sticking.
07 - Using a traditional fluted rectangular cookie cutter, cut out the petit beurre shapes from the rolled dough. Gather and re-roll any scraps to use all the dough.
08 - Place each cut biscuit onto the prepared baking sheet, leaving a small gap between them. Gently prick each biscuit several times with a fork to create the classic dotted pattern and prevent puffing during baking.
09 - Bake on the center rack for 12 minutes, or until the edges and tops turn a lovely golden color. Watch carefully toward the end to avoid over-browning.
10 - Transfer the biscuits to a wire cooling rack immediately and let them cool completely before serving. This ensures they develop their signature crisp, snap-like texture.