Are you mashing it in the tun, or adding it to the boil, or both?
There's precedent for using cooking and cereal in brewing so it should be fine, though you will find that more is better. I used 2.4 pounds of ginger snap cookies in the mash of my ginger snap brown ale, and next time I think I will double it.
If you over the stuff will fade with time, if you under calculate, then you won't have it.
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