TopicPlain sheet cake.
PostedWed, Sep 18th 2019 13:35 PM
It takes two 18-ounce boxes of cake mix to make a half sheet cake, measuring approximately 12-by-18 inches. A half sheet cake provides 36 to 108 servings, depending on how it is sliced. Commercially prepared half sheet cakes are often made by assembling two 9-by-13-inch cakes on a cake board.
The trick after that is figuring out how to adjust the baking time. There is no hard and fast rule, so you’ll have to rely on your senses and checking the cake for the usual signs of doneness, such as pulling away from the sides of the pan or springing back when you touch the center lightly.