Preheat oven to 400°F. Line a baking sheet with parchment paper.
In a medium bowl, whisk together flour, baking powder, salt, and baking soda. Using your fingers or a pastry blender, cut in cold butter until mixture is crumbly. Gradually add buttermilk, stirring just until dry ingredients are moistened. Using a 1-ounce spring-loaded scoop, drop biscuits onto prepared pan.
Bake until golden brown, 12 to 15 minutes. Let cool on pan for 5 minutes. Serve warm.
Recipe by Bake from Scratch at https://bakefromscratch.com/buttermilk-drop-biscuits/