Those looking to satisfy their sweet tooth may be flocking to one wholesaler for a new dessert that is all the rage. Costco's Kirkland Signature Marshmallow Crispy Cookie is the latest dessert to cause a social media frenzy."New! These cookies are perfection," @costcohotfinds posted last week, along with a video of the packaging and tearing one apart."These are the best," one Instagram user wrote in response to the post. "Put it in the microwave for a few seconds…omg so good." COSTCO TO OPEN NEW STAND-ALONE GAS STATIONAnother Instagram video by @costcofam4u shows the cookies sold at her local...

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