Prepare 2 muffin trays (however, you will only need 18 cups) by spraying them with vegetable oil spray.
Preheat oven to 350ºF.
In a large bowl, combine all dry ingredients (flour through cinnamon).
1½ cup whole wheat flour, ¾ cup flaxseed, ¾ cup oat bran, ½ cup brown sugar, 2 tsp baking soda, 1 tsp baking powder, ½ tsp salt, 2 tsp cinnamon
Mix the grated apple to the dry mixture. Make sure it is really mixed up (hands are the best tools) so that the apple shreds get coated with the flour mixture.
2 apple
In another bowl or the measuring cup that you are using to measure the milk, mix together the milk, eggs, oil and vanilla. Add the sweet potato, and make sure the sweet potato is well mixed into the wet mixture. Add this to the flour apple mixture. Mix well with spatula or wooden spoon without over mixing.
¾ cup almond milk, 2 egg, 2 tbsp vegetable oil, 1 tsp vanilla extract, 1 large sweet potato
Spoon into the prepared muffin tins.
Bake for 15-20 minutes.