Creating Nutella Banana Muffins is straightforward if you follow these steps:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C). Line a muffin tin with paper liners or grease it lightly.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, baking soda, and salt.
3. Combine Sugar and Bananas: In another bowl, mix the mashed bananas and sugar until well blended.
4. Add Egg and Oil: Stir in the egg and vegetable oil into the banana mixture. Beat until combined.
5. Add Vanilla and Nutella: Mix in the vanilla extract and ½ cup of Nutella until smooth.
6. Combine Wet and Dry Mixtures: Gradually add the dry ingredients to the wet ingredients, stirring just until combined. Do not overmix!
7. Fold in Chocolate Chips: Gently fold in chocolate chips, if you’re using them.
8. Fill Muffin Cups: Spoon the batter into the prepared muffin tin cups, filling each about 2/3 full. For a decadent touch, dollop a teaspoon of Nutella on top of each muffin and swirl it slightly with a toothpick.
9. Bake the Muffins: Place in the preheated oven and bake for 20-25 minutes or until a toothpick inserted comes out clean.
10. Cool: Remove from the oven and allow the muffins to cool in the tin for about 5 minutes. Then, transfer to a wire rack to cool completely.

Following these simple steps will result in perfectly baked Nutella Banana Muffins that are incredibly tasty!