In the usage “A bowl of…?” I didn’t find any.
However, googling that (sorry, I should have done that first) did reveal these interesting tidbits.
From here: “One can make a simple pudding with corn starch, milk and sugar.” Plus the information that “cornflour” in the UK is called corn starch in the US.
Also from here, a few lines selected from the story where this is used, noting that it is hyphenated here.
’ “Mr. Jones had gone down to the kitchen and demanded a bowl of corn-flour for his wife, who had complained of not feeling well.”
Later: “Miss Clark… told us that the whole of the bowl of corn-flour was drunk not by Mrs. Jones but by her.”
Later: “it is nicely made, too, no lumps… Very few girls nowadays seem to be able to make a bowl of corn-flour nicely.”
Later: “You drink up the bowl of corn-flour.” ’
So it sounds like perhaps a fairly loose or thin pudding made with corn-flour (corn starch), milk and sugar, useful to settle the stomach.