Generously spray a 9x13 baking dish with nonstick cooking spray.
Begin by creaming the butter and sugar together.
Add eggs, one at a time mixing well after each addition.
Mix in vanilla.
In a sperate bowl combine flour, cocoa powder, baking soda and salt.
Gradually add dry mixture to wet mixture, mixing until just combined.
Stir in chocolate chips and chopped candy canes.
Melt butter and chocolate chips in the microwave on high for 1 minute. Remove and stir together. If the choc/butter mixture is not completely melted, put back in microwave for 30 sec. Let sit for about 3 minutes to cool slightly.
Add eggs and sugar into the chocolate and whisk together rapidly.
Add the flour salt and milk, and whisk together to mix completely.
Pour brownie batter into the baking dish.
Add a layer of Oreos on top of the brownie batter.
Cover Oreos with dollops of cookie batter.
Bake until knife is inserted and when remove is clean, about 25 minutes.
To make the ganache, combine chocolate chips, cream and butter in a small pot.
Cook on medium temperature until melted, stirring constantly.
Once done, pour over Brookies and sprinkle with chopped candy canes.