NEW YORK (AP) — Taco Bell fans can finally mark their calendars: Doritos Locos Tacos in Cool Ranch flavor will be launched March 7.

The chain is rolling out the new variety a year after the Doritos Locos Tacos were launched in a Nacho Cheese flavor. Taco Bell says it already sold more than 350 million of finger-staining tacos, making them the biggest ever product launch.

CEO Greg Creed has told the Associated Press that Doritos Locos Tacos now account for about a quarter of all taco sales. Creed says he plans to keep introducing new Doritos flavors as well. Next up is a "Flamas" flavor, a Doritos variety sold in select regions of the country with higher Hispanic populations.