01 - In a small saucepan over low heat, melt the butter with the whole milk. Add the granulated sugar and the scraped seeds from the vanilla bean, stirring continuously until the sugar has fully dissolved and the mixture is smooth.
02 - Remove the saucepan from the heat and allow the butter-milk mixture to cool slightly until lukewarm, then transfer it to a large mixing bowl.
03 - Add the all-purpose flour, baking powder, and fine sea salt to the mixing bowl. Stir with a wooden spoon or spatula until a smooth, homogeneous dough forms and no dry pockets of flour remain.
04 - Shape the dough into a ball, wrap it tightly in plastic wrap, and refrigerate for 1 hour to firm up and make it easier to roll out.
05 - Preheat your oven to 350°F using conventional (static) heat. Line a baking sheet with parchment paper and set aside.
06 - On a lightly floured work surface, roll the chilled dough out to an even thickness of about ⅛ inch (3–4 mm), rotating it occasionally to prevent sticking.
07 - Using a traditional fluted rectangular cookie cutter, cut out as many biscuits as possible from the rolled dough. Gather and re-roll the scraps to cut additional biscuits until all the dough is used.
08 - Place the cut biscuits onto the prepared baking sheet, spacing them about ½ inch apart. Gently prick each biscuit several times with a fork to create the classic pattern and prevent puffing during baking.
09 - Bake on the center rack for 12 minutes, or until the biscuits are evenly golden brown around the edges and set on top.
10 - Transfer the biscuits to a wire cooling rack and let them cool completely before serving. This ensures they develop their signature crisp texture.