One of my favorites is this one:
Bran Muffins with Raisins
2 cups buttermilk
2 tablespoons oil
½ cup honey
2 cups whole wheat flour
1 ½ cups wheat bran (Not Bran Flakes; you can get plain wheat bran at Whole Foods or other natural foods store.)
1 cup raisins
1 teaspoon baking soda
1 teaspoon baking powder
Preheat oven to 350 degrees. Combine buttermilk, egg, oil, and honey. Stir together flour, bran, raisins, baking powder, and baking soda. Add to liquid ingredients. Pour into oiled muffin tins and bake 15-17 minutes.
Variation: Instead of raisins, use 1 cup nuts, 1 mashed ripe banana, ½ cup chopped dates, or ½ cup peanut butter.