Preheat oven to 375 degrees. Line a 12-slot muffin tray with paper liners or spray very well with cooking oil.
Stir yogurt of choice and bran flakes together in a large bowl until combined. Add drained mandarins, brown sugar, egg, and vanilla, and stir well.
In a separate bowl, mix flour, flax, candied ginger, coconut, baking soda, cinnamon, and salt. Add dry ingredients to wet and mix until well combined. The batter should be scoopable but not pourable. If it seems too thick, add milk one tablespoon at a time until a thick but pliable consistence is reached.
With a large spoon or a 1/4-cup measure, scoop batter into prepared muffin tray. Bake about 20 minutes or until knife/toothpick inserted into the center of the muffin comes out clean. Remove from oven and cool at least 10 minutes to let the muffins set, then place on a wire cooling rack to cool further for storage or serve immediately with honey, jam, or fresh fruit, if desired.