I am making an 11 x 15 sheet cake for my granddaughter and I lost the instructions. How much batter? Also, what do you use for stability with a sheet, I am putting a garden of sugar flower and figurines on it and I don't wnat it to collapse. Thank you

I use 2 batches of cake mix that has been added to and put it on at least a 1/4" thick sheet of styro board. HTH

I have the Wilton 11 x 15 (2 inch deep) pan. This is what it says....

Fill pan with about 11 cups of batter (1/2 to 2/3 full). One cake mix yields 4-6 cups batter. Always measure your batter for accuracy. Bake at 325 for 35-40 minutes.

As for your other questions, I'm assuming you're talking about what sort of board to put under it? I usually use a foam board from Walmart (found in the poster board area). I cut it in half, glue the halves together with some craft glue and cover as usual with foil, plastic table cloth, etc. It's plenty sturdy to support this size cake.

Hope that helps.

I use two betty crocker cake mixes for this pan.

Thanks a lot, you are a life saver!