INGREDIENTS
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6.75 ounces all-purpose flour (about 1 1/2 cups)
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3/4 teaspoon baking soda
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1/2 teaspoon baking powder
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1 teaspoon instant espresso powder
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1/2 teaspoon salt
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5 tablespoons Nutella
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3 tablespoons plus 1 teaspoon canola oil, divided
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3 tablespoons unsalted butter, softened
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1/2 cup packed light brown sugar
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2 medium ripe bananas, sliced
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2 large eggs
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1 teaspoon vanilla extract
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2/3 cup whole buttermilk
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1/4 cup hazelnuts, coarsely chopped