Preheat oven to 350 degrees and grease muffin tins with coconut oil.
Mix all dry ingredients in a big bowl (flour, sugar, cinnamon, baking powder/soda).
Blend all wet ingredients in blender (banana, vanilla, spinach, milk, coconut oil).
Gently fold wet ingredients into the dry then pour into muffin tins.
Bake for approximately 16-20 minutes (maybe more)