I am making cake for a baby shower, about 25 people. I have a 11x15 pan. Can I use that or should I use something else? I have used it in the past and my concern is that if I make it according to Wilton I will use 2 cake mixes. It isn't very tall. Is that okay? I don't want to make a 2 layer or I will have more cake than needed? I kind of want to use the 11x15 so I can put my design on top but will rearrange if it won't look good. Could I make the 11x15 with maybe 3 cake mixes to make it taller?

Any advice is greatly appreciated.

I used to be able to use 2 mixes for an 11x15, but recently I'm noticing that it's not enough. I now need about 2 1/2 mixes for that pan. They must be downsizing the mixes. I fill my pans about 2/3 full and that gives me a nice height. That should be plenty for 25 people.

I use 2 mixes. Just did one and it worked just fine. What mix do you use? That could make a difference too. Oh and you also could use the Dream whip recipe with it...it adds on to it as well. Or an extender...when I use the Dream Whip, there will be excess...I usually make cupcakes with it.
And an 11x15 will be more than enough...well IMO.

I usually use Duncan Hines, but will use Pillsbury too.

Thanks. I am a Pilsbury girl. I will try 2 1/2 mixes and see how it works.

I use 2 Betty Crocker mixes, baking strips, grease-only no flouring the pan, 325 degrees. Cake usually rises higher than the pan.