Gluten-Free Banana Bread
1 egg, beaten 1 tablespoon coconut oil, melted 1 tablespoon vinegar 1 teaspoon baking powder 1 teaspoon baking soda 1 teaspoon margarine, or as needed, softened 1 teaspoon sea salt 1 ¼ cups rice flour 2 large bananas, mashed ¼ cup amaranth flour ¼ cup flax seed meal ¼ cup soy flour ½ cup brown sugar ¾ cup almond milk