INGREDIENTS
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4 eggs, separated
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2 cups buttermilk
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1 teaspoon vanilla
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1/4 cup melted unsalted butter
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2 cups all-purpose flour
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1 teaspoon baking powder
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1/2 teaspoon fine sea salt
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2 tablespoons sugar
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1/2 cup Nutella
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1 banana, sliced into quarters lengthwise and then into small chunks
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1 tablespoon melted butter for pan