Is it a brownie? Is it a cookie? Nope, it’s a brookie! Brookies are bars made from marbled layers of fudgy brownie batter and cakey chocolate chip cookie dough. When I first heard of them, I thought they were a silly fad (why mess with the classics?) but then I tried them and, boy, was I wrong!

Brookies are not only super delicious, but they’re also more festive than your basic brownies or chocolate chip cookies. They’re perfect for those occasions when you need a fun potluck treat for all ages — and they’re pretty handy for packing in lunch boxes and late-night snacking, too.

You’ll need two types of chocolate for this recipe: semi-sweet chocolate chips for the cookie layer and bittersweet chocolate for the brownie layer. The label on the bittersweet chocolate I use for this recipe indicates that it contains 60% cacao. Don’t get too caught up in the percentages though, because there are no legal regulations that indicate exactly how much cacao bittersweet chocolate must have. Instead, just make sure what you purchase is labeled bittersweet.

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