This is how we make bran muffins in Utah. Make this the night before and all you will need to do is scoop and bake. I added spices to the original recipe.
You can switch out the spices, I added what our family likes. You can add fresh berries, or chopped apples are yummy as well. This makes a large batch that allows you to bake a small batch for 3 to 4 days.
You can split this recipe no problem.