Chef John's Buttermilk Biscuits

By Chef John

4.66 / 5

20min

15min

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2 cups all-purpose flour
2 teaspoons baking powder
1 teaspoon salt
¼ teaspoon baking soda
7 tablespoons unsalted butter chilled in freezer and cut into thin slices
¾ cup cold buttermilk
2 tablespoons buttermilk for brushing