My _Mexican Cookbook_, Erna Ferguson, U of NMexico Press, 1945 edition of
1934 original, does not contain Chili con Queso or anything closely
related.

On the other hand, it does feature a dish called "Burritos", fresh corn
tortillas rolled thick, stuffed with chicharonnes (described as are today's
versions) and then baked...a far cry from the burritos of today. Evidence
of its New Mexico origin, the book is filled with recipes calling for
squash, green corn and green chiles.

TMO