INGREDIENTS
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1 1/2 cups granulated sugar
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1/2 cup packed light-brown sugar
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3/4 cup unsweetened cocoa powder
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1 tsp baking soda
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3/4 tsp salt
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1 cup boiling water
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3/4 cup canola oil
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2 large eggs
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3 large egg yolks
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1 Tbsp vanilla extract
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2 cups all-purpose flour
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1/3 cup milk
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1/3 cup sour cream
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1 1/2 cups butter, at room temperature (I like to use 1 cup unsalted and 1/2 cup salted)
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3 3/4 cups + 2 Tbsp powdered sugar
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1/2 cup + 2 Tbsp cocoa powder
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3 - 4 Tbsp heavy cream
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1 tsp vanilla extract