Carrot Sheet Cake with Cream Cheese Frosting
Moist, rich, and lightly spiced, this carrot cake received our Test Kitchens' highest rating. We call for a metal baking pan for the cake; if you use a glass baking dish, which conducts heat better than metal, decrease the baking temperature to 325°, and begin checking for doneness after 25 minutes. For the best frosting consistency, use softened butter and cold cream cheese, and add the powdered sugar in batches.