Trader Joe's cookie butter is inspired by speculoos cookies, which originated in Belgium and were made to mimic Dutch speculaas with spices similar to gingerbread cookies.
The cookie base goes well with various other flavors like chocolate, vanilla, and caramel. You can also add the butter to drinks or spread it on bread, fruit, or crackers.
Simply mix Trader Joe's cookie butter into your brownie batter before baking to achieve this extra-rich flavor, or you could use it to add some swirl to your brownies.