Preheat the oven at 400 degrees.
Chop the walnuts. Set aside.
In a large bowl, combine the dry ingredients... whole wheat flour, baking powder, baking soda, cinnamon, and salt.
In a mixing bowl, combine all the wet ingredients... oil, mashed bananas, vanilla extract, honey, egg, and milk.
Add the wet ingredients to the dry.
Mix until all the ingredients are well combined. Do not over mix.
Add the walnuts and fold them in.
Spray a cupcake tray with coconut oil or any other oil. Using an ice-cream scoop, scoop the batter into the muffin holder. Top each muffin with some more chopped walnuts and coconut sugar.
Bake in the oven for 18 minutes exactly at 400 degrees.