Preheat oven to 400 degrees F. Coat a 12-cup muffin pan with cooking spray. In a large bowl, whisk together flour, brown sugar, baking soda, baking powder, nutmeg and salt until there are no lumps.
1 1/4 cup all-purpose flour, 1/2 cup light brown sugar, 1/2 tsp baking soda, 1/2 tsp baking powder, 1/2 tsp ground nutmeg, 1/2 tsp coarse salt
Stir in oats and raisins. Add oil, egg, milk, carrots and banana and stir until blended. Fill each muffin cup with ¼ cup batter.
1 cup old-fashioned rolled oats, 1/2 cup raisins, 3 tbsp olive oil, 1 large egg, 1/3 cup skim milk, 2 carrots, 1 banana
Bake until a toothpick inserted in center of a muffin comes out clean, 18 to 20 minutes. Serve warm!