Costco has added a new sweet treat to its bakery lineup with the debut of its Peanut Butter Monster Cookies."Peanut butter lovers, this one's for you," Costco wrote in an Instagram post this week. "The new Peanut Butter Monster Cookies are at the Costco Bakery!"The 24-count packages feature cookies made with brown butter–flavored dough and packed with peanut butter candies, peanut butter chips, oats and chocolate chunks, according to Delish.REPORT REVEALS WHICH COSTCO ITEMS CAN PAY FOR THE ANNUAL MEMBERSHIPShoppers quickly took to Costco's Instagram comments section to praise the new Peanut Bu...

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