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The Kirkland Ingredient Billie Eilish Uses In Her Favorite Vegan Cookies By Karen Hart Aug. 24, 2025 4:39 pm EST

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When Billie Eilish makes cookies, everyone wants the recipe, and her peanut butter chocolate chip cookies that she shared back in 2021 are still being talked about. Maybe it's because these vegan sweets use an ingredient that Eilish gets at Costco. The "Ocean's Eyes" artist revealed she uses Costco's Kirkland Signature organic peanut butter, and, per People , she noted in an Instagram story: "(fyi this is my FAVORITE PEANUT BUTTER IN THE WORLD so I always use this for everything)."

Costco's store brand definitely has a following, and its peanut butter is one of the Kirkland Signature products every bak

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