Cake/Brownies Question for Making Large Amounts (ingredients, baking, chocolate)

[Davachka]

Daughter's bday is Saturday. Approx 40-50 guests.

Plan was to take 3 boxes of ghirardelli chocolate brownies and tweek the recipe to make a cake out of it. From what I understand that means upping the eggs and oil. 3 boxes makes about 45 servings.

If I bake one box for 40 minutes, how long do I bake 3 boxes for? We were at party city and bought an all-purpose pan that said it was good for baking/roasting, but its foil. I am worried about using it, should I go find a huge glass one instead? If one box needs an 8x8 how big for 3 boxes?

After I make that one, we slip it out of the pan (carefully) then do the same thing over, 3 boxes of ghirardelli brownies made into a cake by upping eggs and oil from what I have read.

Once both cool, cover first in icing, then stack them and cover the top with icing as well.

Does this seem too much, I am worried that they might break when removing. Should I def use glass? Should I just make one huge one instead to minimize the risk of breaking? How long should I bake if making 3 or 6 boxes at a time. As you can see I have many questions . Thanks in advance!!

[46Barb]

I googled the question in and found this on a Continental Mills baking site. This should help answer your question:

Do you have preparation instructions for making a full sheet pan or a half sheet pan of Ghirardelli Triple Chocolate or Double Chocolate Brownies?

DIRECTIONS FOR FULL SHEET (24X16-inch) PAN
6 pouches Ghirardelli Triple Chocolate or Double Chocolate Brownie Mix
2 cups water
2 cups vegetable oil
6 eggs

Blend all ingredients together in large mixer bowl. Mix on low speed for 30 seconds. Scrape bowl and paddle. Continue mixing 30 seconds on low speed. Spread batter evenly into lightly greased 24x16x1-inch sheet pan. Bake at 325°F 40-45 minutes.

DIRECTIONS FOR HALF SHEET (16X12-inch) PAN
3 pouches Ghirardelli Triple Chocolate or Double Chocolate Brownie Mix
1 cup water
1 cup vegetable oil
3 eggs

Blend all ingredients together in large mixer bowl. Mix on low speed for 30 seconds. Scrape bowl and paddle. Continue mixing 30 seconds on low speed. Spread evenly in a lightly greased 16x12-inch pan. Bake at 325°F 40-45 minutes.

[Davachka]

You, Barb, are a life saver. I googled this many times and never came across this website. So, since I am wanting to make cakey brownies, I imagine I will add 12 eggs instead of six.

I think its strange though, that you bake for 45 minutes regardless if its 1 box, 3 boxes or 6 boxes. But that I can test with toothpicks, thanks again I feel a bit more confident now

Originally Posted by 46Barb

I googled the question in and found this on a Continental Mills baking site. This should help answer your question:

Do you have preparation instructions for making a full sheet pan or a half sheet pan of Ghirardelli Triple Chocolate or Double Chocolate Brownies?

DIRECTIONS FOR FULL SHEET (24X16-inch) PAN
6 pouches Ghirardelli Triple Chocolate or Double Chocolate Brownie Mix
2 cups water
2 cups vegetable oil
6 eggs

Blend all ingredients together in large mixer bowl. Mix on low speed for 30 seconds. Scrape bowl and paddle. Continue mixing 30 seconds on low speed. Spread batter evenly into lightly greased 24x16x1-inch sheet pan. Bake at 325°F 40-45 minutes.

DIRECTIONS FOR HALF SHEET (16X12-inch) PAN
3 pouches Ghirardelli Triple Chocolate or Double Chocolate Brownie Mix
1 cup water
1 cup vegetable oil
3 eggs

Blend all ingredients together in large mixer bowl. Mix on low speed for 30 seconds. Scrape bowl and paddle. Continue mixing 30 seconds on low speed. Spread evenly in a lightly greased 16x12-inch pan. Bake at 325°F 40-45 minutes.