Gradually add the dry ingredients to the wet mixture, mixing until just combined. Fold in the grated carrots, chopped walnuts, and raisins using a silicon spatula.
Bake the carrot cake for 55-60 minutes or until a toothpick inserted in the center comes out clean. Remove the cake from the oven and let it cool completely.
When the carrot cake and the frosting are completely cooled down, use a butter knife to spread a generous layer of cream cheese frosting over the top of the cake.