I need am not sure what I am doing wrong but this is the 2nd time i tried to make a square/half sheet cake and both time it turned out rubbery smelled like eggs and tast like . the first cake i tried was a yellow cake and the 2nd was a high ration cake both cooked at 325 degrees. what happen , please help me understand what i may have done. I didn't over mix the batter at all. I can't do wedding cakes like this.

Did you use a box mix or did you make the cake from scratch?

The more information the better to help you.

This is the only info I have on "rubbery":

http://www.ochef.com/625.htm

Cake troubleshooting chart:

http://tinyurl.com/2p5bdu

When mixing do you use a hand or stand mixer?
A medium speed on a hand mixer would be a low speed on a stand mixer.

HTH

I made the cake both times from scratch using a kitchen aid mixture. the high ration sponge cake required:

4 cups of sugar
2 cups of fluid flex
4 cups of eggs
2 cups of butter milk
.88 oz of salt and baking powder
1 1b 10 1/2 oz of cake flour.

the yello cake required:

1 lb of butter and cake shortening
3 ob 10 2/3 oz of sugar
1/2 oz vanilla
3 1/2 cups of whole eggs
1ob 2 oz cake flour and all purpose flour
2 T baking powder
2 tsp of salt
5 cups of mil

I use the cream method for the yellow cake