Oatbran, BRAN, and OAT are all materials that can be used to make muffins. Oatbran is a type of flour made from the outer husks of oats, which is high in dietary fiber and other nutrients. BRAN is the hard outer layer of cereal grains, such as wheat or oats, and is also high in dietary fiber and other nutrients. OAT is a type of cereal grain, and is also high in dietary fiber and other nutrients. All three of these materials can be used to make muffins, providing a nutritious and delicious snack.