Preheat oven to 350°F. Add the cake mix, eggs, milk, oil, sour cream, cinnamon and nutmeg to a large bowl.
Stir the ingredients vigorously for about 2 minutes. You could opt to use an electric hand mixer if desired.
Fold in the pineapple (with juices), shredded carrots and pecans or other add ins to the bowl.
Transfer the mixture to a well greased 9x13 inch baking pan. If you prefer to use different size or shaped pans, follow package directions for bake times.
Bake the carrot cake for 27-32 minutes or until a toothpick comes up mostly clean from the middle. Cool on a cooling rack completely before icing.
Once the cake cools completely, in a medium bowl, combine the entire container of cream cheese frosting along with brown sugar and softened cream cheese. Use an electric mixer to beat until smooth and creamy.
Spread frosting over cake and chill until ready to serve or dig right in! We love to add green and orange sprinkles over top and also some shredded coconut at times. Store frosted cake in the refrigerator for up to 5 days.