Preheat the oven to 450 degrees. Line a baking sheet with parchment.
Whisk the flour, baking powder, baking soda, sugar and salt together in a medium bowl. Rub 2 tablespoons of the cold butter into the flour with your fingertips until completely absorbed. Work the remaining 5 tablespoons of cold butter into the flour with your fingertips until pea-sized bits of butter remain. Use a rubber spatula to stir the buttermilk into the flour until the mixture comes together into a shaggy dough.
Dust a cutting board or work surface with flour and turn the dough out onto it. Pat the dough into a 1/2-inch thick rectangle. Fold dough in thirds, like a letter, and then pat into a 3/4-inch thick rectangle. Cut biscuits out using a 2 1/2-inch round biscuit cutter and put on the prepared baking sheet. Press together the remaining scraps of dough and cut out more biscuits. Brush the biscuit tops with buttermilk.
Bake until the tops are lightly browned, about 15 minutes. Cool on the pan at least 5 minutes. Serve warm or at room temperature.
When measuring flour, we spoon it into a dry measuring cup and level off the excess. (Scooping directly from the bag compacts the flour, resulting in dry baked goods.)
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