In a medium bowl, soak flaked bran in almond milk for 10 minutes.
In a separate bowl, mix together flax seed, chia seeds, baking powder, baking soda, whole wheat flour, and salt.
In another bowl, whisk together the egg, vanilla extract, honey, applesauce, and melted coconut oil until combined.
Add the wet ingredients to the dry ingredients and mix until just combined.
Stir in the soaked bran mixture and gently fold in the blueberries.
Line 18 muffin cups with paper liners and fill each about 3/4 full with the batter.
Bake at 375°F (190°C) for 25–30 minutes, or until muffins spring back to the touch.
Remove from oven and let cool before serving.