Milk buttermilk with bran and let stand. Mix in another bowl, adding one item at a time; oil, eggs, brown sugar, white sugar, vanilla, baking soda, salt, raisins. Mix flour with baking powder and incorporate will. Mix bran mixture with liquid mixture. Quickly mix in by hand the flour mixture.
Bake at 350 degrees for 25 minutes. Made four dozen smaller sized muffins.