Preheat your oven to 350 degrees. Generously grease a 12 cup muffin tin with coconut oil (or line with muffins papers and use a non-stick spray).
Combine flour, tapioca starch, salt, baking soda, cinnamon, and 1/2 cup pecans. Set aside.
In a separate bowl, whisk or beat together coconut oil, mashed banana, vanilla, maple syrup, milk, and eggs. Slowly fold into dry ingredients and mix until well combined (batter will be thick).
Spoon mixture in tins or muffin cups, about 3/4 cup full.
In a small bowl, combine remaining chopped pecans and coconut sugar with 1 tbsp coconut oil. Spoon on top of the muffins.
Bake for about 20 minutes, or until a toothpick inserted comes out clean.
Muffins can be stored at room temperature in an air tight container for up to 3 days, or stored in the freezer.