2 cups all-purpose flour (a soft wheat brand like White Lily will turn out the best biscuits)
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4 teaspoons baking powder
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1 teaspoon salt
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1/2 teaspoon baking soda
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6 tablespoons unsalted butter (cold, cut into chunks)
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1 cup buttermilk (can also use milk, cream, or half-and-half or splash a little vinegar into the bottom of a measuring cup and fill it the rest of the way with milk to approximate buttermilk)