Currently I think the [bread] tag covers baking bread and using bread in cooking (and even a question about using bread as something to eat off).
Seems to me bread is a case where making it is different from using it as an ingredient and tags should reflect this distinction.
There may be other core foods where the same thing applies.
Also, is it expected (or even encouraged) that an ordinary member (albeit with 200 rep or whatever is required to retag) might implement this kind of global change (more or less feasible with the 20 or so bread questions which currently exist). Or is it a mod job?