This peppermint brownie brittle recipe is crispy/crunchy, makes a ton, and is perfect to give to friends--or snack on yourself--for Christmas. And yes, you probably should dunk it in milk. NOTE: All measurements are by weight.
Place a rack in the top and bottom thirds of your oven (or bake in 2 batches, setting a rack in the center of the oven).
Preheat oven to 300F.
Line two half sheet pans with Silpat. Set aside.
In the bowl of your stand mixer fitted with the whisk attachment, whip whites, brown sugar, granuated sugar, salt, vanilla, and peppermint extract until very light and thick, about 5 minutes. Stop the mixer.
Sift the flour, cocoa powder and baking soda together and add to the mixer bowl. Mix on low speed until incorporated, scraping the bowl thoroughly.
With the mixer running on medium speed, pour the butter in down the inside of the bowl and mix until well blended. Scrape bowl as necessary.
Plop half the batter on each of the prepared pans. Using an offset spatula, spread out as thinly as you can.
Sprinkle half of the peppermint bark evenly over each pan of batter.* (See Note)
Bake for 15 minutes, rotating pans and switching racks halfway through.
Remove the pans from the oven and score the peppermint bark brownie bark with a small pizza cutter or a knife. You can score it in whatever shapes you like.
Return to the oven for an additional 20 minutes, rotating pans and switching racks halfway through.
Allow the bark to cool in the pans for 5 minutes and then carefully remove the bark to racks to cool completely.
Bark might not be completely crisp when it's still hot, but it should crisp up nicely once cool. If any pieces--especially center pieces--seem less crisp that you'd like, just put them back in the oven for an additional 5 minutes or so.
Enjoy!
Notes
NOTE: All measurements are by weight. Please get a kitchen scale if you don't already have one. It will make your life so much easier, I promise!*If you add the chopped bark now, the white chocolate will lightly caramelize while baking. I love the depth you get from caramelized white chocolate, but it's not as pretty as bright ivory white chocolate. To keep the color bright, wait to add the chopped bark to the top of the batter until the last 5 minutes in the oven. Once you remove the pans from the oven, rescore the brittle along the lines you already cut, just in case some of the bark has melted and will hold your pieces together once it cools. I'm sure there's a better way to say that, but that's all I've got right now.