This is a very large yield recipe for plain, sweet bran muffin batter that you can keep in your refrigerator for up to six weeks. This could mean freshly baked muffins every morning, even for busy folks with no time to waste. October 8, 2021October 8, 2021 Emily Morgan This is a very large yield recipe for plain, sweet bran muffin batter that you can keep in your refrigerator for up to six weeks. This could mean freshly baked muffins every morning, even for busy folks with no time to waste.