"Sold in a pack of 24 cookies for $10.99 (that's just 45 cents a piece), these never-before-seen treats are loaded with peanut butter chips, chocolate chunks, rolled oats, and colorful, crispy peanut butter candy morsels a la Reese's Pieces. They feature the same soft and chewy texture and generous size as the rest of Costco's bakery cookie lineup. Shoppers on social media who have tried the new sweets can't recommend them enough."
"They feature the same soft and chewy texture and generous size as the rest of Costco's bakery cookie lineup. Shoppers on social media who have tried the new sweets can't recommend them enough. 'Just saw these today, tried one - they are dangerously good,' one Reddit user wrote. A Facebook reviewer also said the cookies are 'insanely addictive and get better with every bite.' Another Redditor added, 'Not a huge PB cookie fan and these were the bomb.'"
"The PB Monster Cookies could very well end up on the list of the best Costco desserts to buy according to shoppers, and while they're undoubtedly great when eaten as-is, we can think of so many ways to dress them up and put any leftovers to use. Costco customers who have tried the Peanut Butter Monster Cookies find it hard to resist downing the whole package at once, but if you don't have a big household, 24 pieces can be a lot to finish."
Costco introduced Kirkland Signature Peanut Butter Monster Cookies in January 2026, available in warehouses across the U.S. The cookies come in a pack of 24 for $10.99, about 45 cents apiece. They contain peanut butter chips, chocolate chunks, rolled oats, and colorful, crispy peanut butter candy morsels similar to Reese's Pieces. The cookies have a soft, chewy texture and a generous size consistent with Costco's bakery lineup. Early shoppers on social media gave enthusiastic reviews, calling them 'dangerously good' and 'insanely addictive.' The cookies work well as-is and can be repurposed into desserts, such as ice cream sandwiches using Costco vanilla soft serve or Kirkland Signature ice cream.
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