Triple the layers, triple the brownie fun

Triple-decker brownies are a dream come true for indecisive cookie lovers everywhere. Known in some circles by a less tactful name, this classic mashup consists of a chocolate chip cookie dough base shingled with chocolate sandwich cookies and draped in brownie batter. It’s tempting to cut into it while it’s still warm from the oven, but for the perfect cross-section, make sure to cool the pan completely (with an optional 30 minutes in the refrigerator). The cookie dough provides a chewy foundation for the slightly crisp sandwich cookies and gooey brownie, creating a three-way celebration of chocolate treats that’s hard to match. It all comes together by hand, but if you prefer, an electric mixer makes for quick and easy work.

Directions:

Heat the oven to 350 degrees. Butter a metal 9-by-13-inch baking pan and line with parchment paper so there’s overhang on the long sides, then butter the parchment. Fill a medium saucepan with about 2 inches of water and bring to a simmer over medium heat (you’ll need it in Step 4).

Make the cookie layer: As the water comes to a simmer, in a large heatproof bowl (metal preferred), mix together the butter, ...