Preheat oven to 375 degrees F. Grease a loaf pan and set aside.

Mash up your bananas in a large bowl, and then add in the melted butter. Mix in the egg, sugar, and vanilla. Then add in your baking soda and salt, and mix well. Lastly, add the flour and pecans. Do not overmix.

Bake 55 to 60 minutes, or until a toothpick inserted in the center comes out clean. Let cool completely completely before slicing. Store in an airtight container.