Preheat oven to 350°F. Spray a 12-cup muffin pan with cooking spray.
In a large bowl, combine flour, oats, baking powder, baking soda, cinnamon, nutmeg, and salt.
In another large bowl, whisk egg, egg whites, and Splenda Brown Sugar Blend until well combined. Whisk in applesauce, oil, orange peel, and vanilla extract. Stir in carrots and raisins.
Add dry ingredients and mix just until moistened. (Batter will be lumpy.) Spoon batter into prepared pan, filling each cup about ⅔ full.
Bake for 20–25 minutes or until a wooden pick inserted in the center of a muffin comes out clean. Cool in pan 10 minutes, then transfer to a wire rack to cool.