Hi Elizabeth, If you're looking to use bran flakes instead of bran cereal, we recommend using the recipe for Zella Lane's 2-Week Bran Muffins. This recipe is designed to work with either cereal or flakes, so take your pick. Otherwise, substituting natural wheat bran in this recipe may result in crumbly baked good, so we think you're better off with Zella's. Happy baking! Kye@KAF

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