Makes 12 muffins

1/4 cup canola oil
1 egg
3/4 cup buttermilk
1/4 cup chopped raisins or walnuts
2 cups raisin bran cereal
1 1/4 cup unbleached flour
3/4 cup sugar
1 1/4 teaspoons baking soda

In a medium bowl, mix the oil, egg, buttermilk, raisins or walnuts and the cereal. Cover and refrigerate for 1 hour.
In a large bowl, whisk the flour, sugar and baking soda. Stir the dry ingredients into the buttermilk mixture. Coat a 12 cup muffin pan with nonstick spray. Spoon the batter into the muffin cups, filling each 2/3 full.
Bake at 400 degrees until a toothpick inserted in the center of a muffin comes out clean (about 20 minutes). Place the muffin pan on a wire rack and allow the muffins to cool in the pan for 5 minutes. Remove the muffins from the pan. Serve warm.