I agree, early on I had recessive white from their white cornish heritage show up fairly regularly in my birds. I would think putting a bantam light Brahma male over bantam white Cornish hens would be a good start. Assuming the white is masking dark cornish color like in the large fowl I used. Both e^b based, no comb, or leg color issues, improved head. You could take this in many directions, white Brahmas, improve heads on lights, make silver laced in both breeds, silver quail, if so inclined. Actually, I have seen bantam silver laced Cornish years ago at the Ohio National.