When a double batch of chocolate cake is necessary, follow a few simple guidelines to ensure success. First, decide what outcome you are looking for. One large cake made out of two boxes of cake mix will need a different temperature and bake time than two smaller cakes, so everything needs to be adjusted accordingly.
Baking the Perfect Cake
If your goal is to make twice the amount of cake and bake it in twice the number of pans, no change to temperature or time is necessary. For example, if you'd like to make two boxes of cake and bake it in four 8-inch pans, keep it at 350 degrees Farhenheit for about a half an hour, checking for doneness after 25 minutes. On the other hand, if you are doubling the amount of mix and would like to make one large sheet cake, pour it into an 11-by-15 inch rectangular pan and bake at 325 degrees for 35 to 40 minutes. Bear in mind that one box of mix is five to six cups of batter and that different shaped pans might require adjustments to baking time. Check for doneness by lightly touching the center of the cake. If it springs back, it's done.
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