This savory chili and cheese pie comes from chef Dolores Torres Yza'bal, who worked with Diana Kennedy on the television program "Mexican Cooking". I found it in a May 1987 issue of Bon Appetit in an article titled Mexican Cooking Goes Light. If using the equivalent of the Crema Fresca, start it the day before. This standing time for this is not included in prep time. Crema Fresca is the Mexican equilavent of the French creme fraiche.