INGREDIENTS
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1 1/2 cup butter (3 sticks), room temperature
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2 cups granulated sugar
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2 teaspoons vanilla
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5 eggs
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1/2 cup cocoa powder
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1 teaspoon kosher salt
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1 teaspoon baking powder
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1/2 teaspoon baking soda
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1 cup buttermilk
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3 cups cake flour
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2 cups chocolate chips
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1/2 cup butter
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2 tablespoons cocoa powder
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3 tablespoons milk
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3 cups powdered sugar