"Moist banana muffins with swirls of Nutella in every scrumptious bite!..."
INGREDIENTS
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1 cup (2 sticks) unsalted butter, melted
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1 cup granulated sugar
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2 large eggs
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1 teaspoon vanilla
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2 cups all-purpose flour
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1 teaspoon baking soda
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4 overripe bananas, mashed (about 1-1/2 cups)
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1/2 cup Nutella chocolate hazelnut spread
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1 ripe banana, for garnishing