Instructions

1. Preheat oven to 350F. Line a standard muffin tin with muffin liners.
2. Melt the 1/2 cup unsalted butter, the pour into a large mixing bowl to cool slightly.
3. In a medium sized mixing bowl, combine the flour, baking soda, and salt. Whisk well to combine, and set aside.
4. To the butter, add the sugar. Add the egg to a liquid measuring cup and then add milk to make one cup. Add this to the mixing bowl with the butter and sugar. Whisk well. Then add the 1 ripe banana, mashed with a fork, and whisk until everything is well combined.
5. Finally, fold in the flour mixture, stopping when there are still a few streaks of dry flour left. Don’t over-mix.
6. Separate about 1 cup of the batter and mix in the Nutella. It can help to microwave the Nutella for 30 seconds to make it easier to stir.
7. Pour batter into the prepared muffin tin, alternating with globs of the Nutella batter, aiming for a marbled effect.
8. Bake muffins for about 25-30 minutes, until the muffins are risen and golden brown on top, and a toothpick inserted in the middle comes out clean.