Where were rice crispy treats first made?

While it's impossible to pinpoint the exact origin of Rice Krispies Treats, the Kellogg's Company is credited with popularizing the treat.

Here's what we know:

* 1920s: Rice Krispies cereal was first introduced, creating the foundation for the treat.

* 1930s: A recipe for "Rice Krispie Squares" was included in a Kellogg's promotional booklet called "The Homemaker's Guide to Better Cooking." This recipe is considered the earliest known version of the treat.

* 1939: The recipe was featured in a Kellogg's cookbook called "The Rice Krispies Cookbook," further popularizing it.

Therefore, while the exact origin might be unknown, the Kellogg's Company played a significant role in popularizing the Rice Krispies Treat during the 1930s.