Preheat oven to 425°. Line a rimmed baking sheet with parchment paper.
In a medium bowl, whisk together flour, baking powder, and salt. Using a pastry blender, cut in butter until mixture is crumbly. Gradually add 1¼ cups buttermilk, stirring just until combined.
On a lightly floured surface, turn out dough, and knead gently 5 times; press into a ½-inch-thick round. Using a 3-inch biscuit cutter, cut dough, rerolling once. Place biscuits side by side on prepared baking sheet. Brush biscuits with remaining ¼ cup buttermilk, and sprinkle with pepper.
Bake until golden brown, 18 to 20 minutes.
Recipe by Southern Lady Magazine at https://southernladymagazine.com/black-pepper-biscuits-recipe/