Preheat oven to 350 degrees.
In a large bowl, mix dry ingredients together. Create a well in the center and set aside.
Blend egg, bananas and orange juice for a few seconds in a blender (or mash with a fork and whisk together), then pour into a small bowl.
Pour the banana orange mixtures into dry ingredients and mix just until combined. Fold in coconut.
Place cupcake liners in muffin tins (alternatively, you could simply grease the muffin tins). Fill cupcake liners 2/3 of the way full with batter. An ice cream scoop works perfectly for this.
Bake for about 20 minutes, or until tops are lightly browned and a toothpick inserted into the center comes out clean.