INGREDIENTS
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1–1/3 cups cake flour
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1/3 cup cocoa powder
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1/2 tsp baking soda
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1/4 tsp baking powder
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1/2 tsp salt
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1 stick unsalted butter, softened
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1-1/2 cups light brown sugar
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2 tsp vanilla extract
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2 eggs
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3/4 cup sour cream
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3/4 cup hot coffee
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1 (26.5-oz) jar Nutella spread
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2 oz hazelnuts, toasted and chopped