Oat bran is the outer husk of the oat grain oat bran is a good source of fibre protein and iron one common use of oat bran is as an additive in baked goods like muffins where it adds a very distinctive texture and rich nutty flavor it is also added to breakfast cereals or used alone as a cereal oat bran is also added to breads increasing their fibre content and some artisan breads are dusted with oat bran before they are baked to create a flavorful topping enterprising cooks also add i