ORANGE COUNTY, Calif. – Starbucks is expanding ice cream to its Reserve bars, plus 100 regular locations, after a successful introduction at the Seattle Roastery, the Seattle Times reports. Yesterday, the Roastery Affogato menu, which has its roots in the Italian espresso-poured-over ice cream treat, debuted at the 18 Reserve bar locations across the country, as well as dozens of traditional stores in Orange County.

The affogato items have been tested at the Seattle Roastery since June, and quickly became among the top five bestsellers. The affogato menu includes affogato, cold brew malted shakes and cold brew floats. All items will be made will ice cream from Mora Iced Creamery.

Starbucks is using its Seattle Roastery as a place to try innovations and new menu items for the company. The company will evaluate customer response at these traditional and Reserve stores before rolling it out across all locations.

In late January, Starbucks announced that its mobile ordering app had created long lines inside its stores, which might have turned other customers away. The coffeehouse indicated it is already working on a solution to that issue.