TopicFrozen half sheet cake.
PostedMon, Aug 05th 2019 23:33 PM
In general, the 13-by-9-inch cake will take about 5 to 10 minutes less than the 9-inch layers. To be safe, start checking about 15 minutes before the time in the original recipe. Cupcakes usually take about half as long as a 9-inch round cake. If the cake called for 30 to 35 minutes of baking time, start checking the cupcakes after 15 minutes.
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.