Preheat the oven to 375 degrees. Prepare a muffin tin with baking cups spritzed with nonstick cooking spray.
Whisk together the flour, baking soda, and salt.
In a large mixing bowl, mash the bananas. Add the egg, vegetable oil, and vanilla extract. Stir to mix well. Add the sugar and continue mixing until completely blended.
To the large mixing bowl, add the flour mixture and stir just until completely blended. Stir in the nuts, leaving some to add on top.
Using a large scoop, divide the muffin batter between the 12 muffin cups. Top with the remaining nuts.
Bake for 12-15 minutes or until a toothpick inserted in the middle of a muffin returns clean.
Disclaimer:
Any nutritional data I provide is an approximation and actual dietary information can vary based on ingredients and proportion sizes.