In celebration of its most-successful new-product launch to date, Chick-fil-A recently announced a Hand-Spun Milkshake flavor that will be green as well. Starting March 17 (St. Patrick’s Day), Chick-fil-A restaurants nationwide will offer a Hand-Spun Mint Cookies and Cream Milkshake. As a limited-time flavor, the Mint Cookies and Cream Milkshake will be available through June 30.

Like the other flavors, the Mint Cookies and Cream Milkshake is made from Chick-fil-A’s popular home-style Icedream and topped with light whipped cream and a maraschino cherry. The Mint Cookies and Cream Milkshakes will include premium ingredients, such as Oreo Sandwich Cookies, and mint flavoring. Mint Cookies and Cream Milkshakes will be offered in a 20 oz. cup and are priced starting at $2.79 each at most locations.

According to representatives at Chick-fil-A, the selection of the new flavor had less to do with science than with celebration:

“The Mint Cookies and Cream Milkshake is just plain fun,” says Woody Faulk, Chick-fil-A’s vice president of brand development. “Following last year’s highly successful rollout of Hand-Spun Milkshakes, we wanted to let our customers know that we appreciate their enthusiastic support of the shakes–and that we have a few surprises in store for them.”

Chick-fil-A’s line of Hand-Spun Milkshakes recorded a respectable two percent of sales in its first week–well before the chain initiated its full-scale marketing campaign to support the product into the summer months. For the remainder of the year, Milkshakes maintained an average percent-of-sales level of four percent.

Critical to the success of Hand-Spun Milkshakes has been the chain’s ability to provide a quality product without compromising speed of service at high-volume drive-thrus or at the front counter. “Chick-fil-A was able to rollout Hand-Spun Milkshakes for one reason only–our restaurant operators and their team members,” says Faulk. “They rose to the speed-of-service challenge and helped make our Hand-Spun Milkshakes so successful.”