Use ripe bananas: Very ripe bananas (ones with lots of brown patches) work best in banana Nutella muffins, offering the best flavor and amount of sweetness.
Mashing the bananas: Use a potato masher to mash the bananas.
Don't over-mix the batter: The ingredients should be just combined. Over-mixing results in dense muffins.
Check they're done: Use a toothpick inserted in the center of a muffin to check for doneness. If there's wet batter on it when removed, give the muffins another few minutes and test again. They're done when the toothpick comes out clean or with just a couple of moist crumbs.
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