Mars Inc., which has its U.S. headquarters in Newark, is teaming up with celebrity chef Christina Tosi of Milk Bar on a limited drop of 100 one-time-only cookies hand-baked by Tosi herself.

The promotion aligns with the nationwide release of the new M&M’S Crunchy Cookie, a crunchy centered cookie covered in milk chocolate and wrapped in a candy shell.

“Thinking up new and never-before-heard-of desserts is what I love to do, so the opportunity to develop a Mars cookie inspired by the new M&M’S Crunchy Cookie candies was a real treat,” said Tosi, founder and CEO of Milk Bar. “The texture and crunch of M&M’S Crunchy Cookie is so unique, it was important to me that I designed the M&M’S x Christina Tosi Crunchy Cookie crunchy cookie to include layers of crunch to mimic the M&M’S candy, so that each bite offers the ultimate crunchy cookie experience.”

Starting March 29, fans can scan the QR code on M&M’S Crunchy Cookie packs or visit the website to to be notified when the limited-run of M&M’S x Christina Tosi Crunchy Cookies are available. M&M’S will announce when the drop goes live via social media, and via email for those who pre-registered to be notified.

The window to claim a cookie will be open for only a limited time and will be based on a first-come, first-served basis.

Those who miss getting their hands on the M&M’S x Christina Tosi Crunchy Cookies cookies can still receive the recipe via email so they can make the tasty treat at home. Tosi will highlight the recipe in her weekly Bake Club on April 4 at 2 p.m. on her Instagram.

M&M’S Crunchy Cookies are now available nationwide.