Preheat oven to 350 degrees F . Lightly coat twelve to sixteen 2 1/2-inch muffin cups with nonstick cooking spray or place with "cupcake" liners; set aside.
In a large bowl stir yogurt into bran cereal, let stand for 5 to 10 minutes or until cereal is softened.
In small bowl stir together flour, Nutrim, baking powder, cinnamon and baking soda. Set mixture aside.
Stir eggs, brown sugar, syrup, and oil into bran mixture.
Add flour mixture to bran mixture, along with raisins. Stir until all ingredients are combined.
Spoon batter evenly into prepared muffin cups, filling each to where they are nearly full.
Place in oven and cook for 25 to 30 minutes or until tops of muffins have a brown tint to them. Pierce muffins with tooth picks to make sure toothpick comes out clean.