Which snack is a sweet, sticky ball made by combining puffed rice with melted marshmallow?

A Rice Krispies Treat is a sweet, sticky snack made by combining puffed rice cereal with melted marshmallow.

The recipe uses Rice Krispies cereal, butter or margarine, and marshmallows. The marshmallows are melted with the fat, the cereal is stirred in, and the mixture is pressed into a pan or shaped into individual squares before cooling.

The treat was created in 1939 by Mildred Day and Malitta Jensen, employees of the Kellogg Company. It was originally developed as a fundraiser for Campfire Girls. Kellogg later promoted the recipe on cereal boxes and in advertising, helping it become a familiar homemade snack.

Rice Krispies Treats are sometimes confused with granola bars, but their characteristic binding ingredient is melted marshmallow. Variations may add chocolate, peanut butter, candy, or dried fruit, though the classic version contains the three basic components.