In a large mixing bowl, combine the flour, baking powder, cinnamon, baking soda, salt, ginger and nutmeg. Blend well with a whisk. In a separate, small bowl, toss the raisins with 1 teaspoon flour so they don't stick together. Add the grated carrots, chopped walnuts and floured raisins to the other ingredients and stir to combine.
Preheat oven to 425 degrees Fahrenheit. If necessary, grease all 12 cups on your muffin tin with butter or non-stick cooking spray (my pan is non-stick and doesn’t require any grease).