It's-It ice cream sandwich

It's-It Ice Cream is an ice cream manufacturer and distributor since 1928, based in Burlingame, California. The company is best known for the popular It's-It ice cream sandwich, which is a scoop of ice cream sandwiched between two oatmeal cookies and dipped in dark chocolate. The original vanilla It's-It has been available in additional flavors since the 1980s. The It's-It was invented in 1928 by George Whitney, one of the original business owners when San Francisco's Playland at the Beach opened across the Great Highway from Ocean Beach. One version of the name's origins is that Whitney was experimenting and cried out "It's-It!" when he hit on the combination of a sandwich of vanilla ice cream inside two oatmeal cookies, covered in chocolate. Another version is that he heard someone answer the question which cow had won a cow race that day ; the cow's name was It.

Source: Wikipedia