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I agreeYou won't form any breed--you'll make a mixed breed or mutt.
Since "bantam" means a chicken bred to be small and is not a breed in and of itself, I don't know if you even have a purebred bantam rooster. And when you start outcrossing mixed breeds, it's almost impossible to predict the outcome, sorry.
I would guess that you mean a standard white broiler hen. If that's so, then I would expect the offspring to be white, possibly with some spots on them or red coming through in the neck and breast feathers.
x2I agree
There will just be mutts. A few of us don't even think your "bantam cock" is a purebred rooster. It is going to be very unlikley that someone has done the exact same cross, especially not even knowing what all your rooster is mixed with. Just do a test hatch and you will know
I crossed white rock cornish (meaties) with black sex links and buff orpingtons, non were bantam sized. Both crosses grew fairly quickly, but not as quick as the meaties. All started off white but as they matured, the hens turned varying shades of cream and the roosters got red on their wings, hackles, and saddles. Don't know how much this will help you but its what happened here.