To make Cereal Milk, breeder Kenny Powers crossed The Y (a.k.a. Y Life, which itself is Cookies crossed with Cherry Pie) and Snowman, a sativa phenotype of Cookies. The Cookie Fam breeders selected the best phenotype for commercial production. You can see the lineage in Cereal Milk, which is dense, icy, and loud, with a very loopy, time-warping hybrid effect.
Berner’s brand Cookies has put Cereal Milk into limited production in California, where it can be found at Berner’s licensed Cookies stores near Los Angeles.