Well, at first we need to know meaning of cooking in spanish : ) and only then do any decision. But honestly, mate, I am supporting your friend, which is on right(not left one) side.
2021-06-23 23:11:59 +0000 UTC
By the all mighty google cooking is: “the practice or skill of preparing food by combining, mixing, and heating ingredients.”
So if you heat milk for you cereal and then mix it and prepare it. We can say it’s cooking i guess