INGREDIENTS
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2 cups all-purpose flour
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1 3/4 cups sugar
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1 1/2 teaspoons baking soda
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2 sticks (1 cup) unsalted butter
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1/3 cup high-quality cocoa powder (use the best you can find)
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1 cup water
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1/2 tsp fine salt
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2 large eggs
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1/2 cup sour cream
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1 teaspoon vanilla extract