Whisk the bran, flour, baking powder and salt together in a medium bowl.
In a separate large bowl, whisk all the remaining ingredients.
Add the dry ingredients into the wet ingredients and whisk until combined. Cover and refrigerate 1 hour.
Preheat your oven to 450 degrees and spray a muffin tin with cooking spray.
Use an ice cream scoop (a spoon works too) to fill 9 muffin cavities about 2/3 of the way full.
Bake for 5 minutes. Then, turn the oven temperature down to 375 degrees and bake another 15-17 minutes, or until a toothpick inserted in the center comes out clean.