Begin by preheating your oven to 350 degrees.
Next, spray a loaf pan with non-stick cooking spray.
In a large mixing bowl add flour, sugar, brown sugar, baking soda, salt, cinnamon, and nutmeg.
Next gently fold in the eggs, vanilla, and bananas.
Add your melted butter (make sure it is cooled before so it does not scramble the eggs when mixed in).
Add the buttermilk and molasses and mix well with a hand mixer for about three minutes.
If desired add ½ cup of walnuts or pecans. Gently stir into the mix with a wooden spoon or a spatula.
Pour into a loaf pan and bake for about 1 hour and 15 minutes or until a tooth pick comes out clean from the middle.