Mcdonald's Bran Muffins

3 c buttermilk
3 eggs
1/3 c oil
1 1/2 t baking soda
1 1/2 t baking powder
1 t salt
1 t vanilla
1 c sugar
3 c bran flakes -- slightly
1 crush
3 c all-purpose flour
Put first ingredients through blender on high speed 20 seconds. Pour
into bowl and beat in remaining ingredients at low speed of mixer
until completely mixed. Cover and refrigerate 24 hours. Fill greased
muffin well almost full and bake 400 20 to 25 minutes or until
cracked on top and a toothpick inserted in center comes out clean. 1
tb plumped raisins can be added to each well of batter before baking.