INGREDIENTS
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4 c. all-purpose flour
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2 c. sugar
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1 c. brown sugar
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2 1/4 c. Dutch-processed cocoa powder
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3 tsp. baking soda
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3 tsp. baking powder
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pinch of kosher salt
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1 1/2 c. melted butter
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6 large eggs, lightly beaten
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2 1/2 c. strong black coffee
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2 1/2 c. buttermilk
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1 tbsp. pure vanilla extract
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3 c. butter, softened
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7 1/2 c. powdered sugar
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2 1/4 c. cocoa powder
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1 tbsp. pure vanilla extract
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pinch of kosher salt
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3/4 c. heavy cream (plus more if necessary)
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4 c. semisweet chocolate chips, divided