I usually make 11X15 sheet cakes for things like baby showers (if they request a sheet cake that is) and I use 2 doctored cake mixes for that size pan. However, my cousin is concerned that it will not be enough for a baby shower with maybe 30 people...is she right? Am I being cake stingy?
I checked the cake guides and they show square, oval, round, petal, hex, etc etc....but not sheet cake sizes....have I just not found the right place to look?
I would definitely say that a 11 X 15 (1/2 sheet) cake would feed 30 people. I usually tell my customers that it will feed 30-40 people, depending on how big of a piece you want. For my family, we like bigger pieces and I still would make that size of cake for 30 people.
If she wants more cake, is she willing to pay for more? Or is this a gift to your cousin?
You could make the 11x15, and do it half choc/half white, using only 2 mixes. If you do the 12x18, I use 3 boxes to fill the pan, and you would end up doing 2 & 2 to get a good height with choc/white.
Hope that makes sense.
I use 3 mixes for the 12x18 and when I do 1/2-n-1/2, I use 2 white and 1 chocolate. Chocolate rises higher (and spreads more in the pan) than white cake, so it ends up being almost 1/2 white and 1/2 chocolate. I've always done them this way and no one has said anything about it not being exactly 1/2-n-1/2.
my son's 3rd birthday had about 20 people. I ordered a half sheet cake by *gasp* Walmart (hey, no one else had the "cars" toppers and a lot of the reason I wanted to learn to do it myself). I had more than half the cake left and ended up throwing a great deal of it out. I think 1/2 sheet would be fine.
I use 3 mixes for the 12x18 and when I do 1/2-n-1/2, I use 2 white and 1 chocolate. Chocolate rises higher (and spreads more in the pan) than white cake, so it ends up being almost 1/2 white and 1/2 chocolate. I've always done them this way and no one has said anything about it not being exactly 1/2-n-1/2.
The next time I do a half/half I am going to have to try this.
You could also use the cake mix extender recipe from this site. Use it on each box and you should have plenty! For example, 1 cake mix using the extender recipe yields 3 9" rounds instead of just 2! PLUS...IT TASTES LIKE SCRATCH!!
recipe:
http://www.cakecentral.com/cake_recipe-1977-Cake-Mix-extender.html
When I use the extender with Devils Food or Chocolate Cake I don't add any Cocoa Powder and it's still plenty chocolaty.
Make sure that if you do want to add Cocoa to make it stronger, don't use more than 2 Tbsp of cocoa powder or the cake will become dry.
Quote:
Do the math:
11x15 sheet: pieces cut in 2"x3" pieces = 5 columns by 5 rows = 25 pcs
11x15 sheet: pieces cut in 2"x2" pieces = 5 columns by 7 rows = 35 pcs
This is assuming a 1-layer cake. It all depends on how big you want the pieces to be.
Indydebi: You're one smart logical lady. 
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