Preheat oven to 350°F. Grease a loaf pan and line it with baking paper. Whisk together the plantain flour, almond meal, baking soda, and salt. In a separate bowl, beat egg, vanilla extract, sugar, maple syrup, orange juice, coconut oil and (last,) the melted butter. If not using a mixer, mash the bananas then mix in. Else add bananas in pieces. Beat in the dry ingredients, and pour into pan. Immediately bake 40min. or until a toothpick comes out clean.