From The Hamilton Beach Test Kitchen
Added by Pat
Success Tip: If using bran flakes cereal, be certain it is not the sugarcoated variety. Check the ingredient list and if sugar is listed, it should be near the bottom of the ingredient list.
Substitution: If buttermilk isn't available, put 2 tablespoons of vinegar or lemon juice in a 2-cup measure. Add milk to make 2 cups.