Combine flour, baking soda, baking powder, and salt in a small bowl using a wire whisk or fork and set aside.
In a larger bowl, beat together oil, vanilla extract, milk, egg, granulated sugar, brown sugar, and mashed banana.
Slowly sprinkle the dry ingredients (the flour mixture) over the banana mixture wet ingredients using a spatula to fold the dry into the wet.
Quickly add, and fold in, any additions to your batter at this time such as chocolate chips or walnuts.
Pour batter into greased loaf pan and bake 65 to 70 minutes or until a toothpick inserted in the center and to the left and right of center, comes out clean.
Cool on wire rack for 10 minutes. Remove from pan and cool completely before slicing.
Notes
Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.
As with any of my recipes, calorie counts and nutritional information varies greatly depending on which products you choose to use when cooking this dish.