Preheat oven to 375 degrees Fahrenheit (190 degrees Celsius).

Combine all dry ingredients (whole wheat flour, wheat bran, soda, baking powder, and salt) in a large bowl.

In a separate bowl, combine all liquid ingredients (buttermilk or milk, molasses, corn oil, and egg).

Pour the liquid ingredients into the dry ingredients and blend until just combined. Do not overmix.

If desired, add raisins, nuts, or dates.

Place paper liners in a muffin tin.

Fill each muffin liner about 2/3 full with batter.

Bake in the preheated oven for 15 minutes, or until a toothpick inserted into the center comes out clean.

Let cool slightly before serving.