Preheat oven to 350°F. Line an 8"x8" square pan with parchment paper. Lightly spray the parchment with nonstick cooking spray. Set aside.
In a medium sized bowl add the warm melted butter. Stir in the cocoa powder. Next add the sugar and whisk to combine.
Whisk in the eggs, vanilla, vinegar, and red food coloring. Using a rubber spatula, stir in the flour and salt until just combined. Spoon the batter into the prepared pan, spread into an even layer.
Bake for 22-24 minutes or until toothpick inserted in center comes out with moist crumbs. Remove from the oven and let brownies cool for 10 minutes before adding the Oreo truffle layer on top.
Make the Oreo Truffle Layer
While the brownies are cooling make the Oreo truffle layer. In a medium sized bowl mix the crushed Oreos and cream cheese until combined. Place the oreo truffle mixture between two sheets of parchment or wax paper. Use a rolling pin, or your hands, to press the oreo truffle into an 8"x8" square. Chill in the fridge or freezer for 10 minutes to help the oreo truffle be easier to transfer to the brownies. Once slightly chilled remove the parchment paper and transfer the oreo truffle to the top of the baked and slightly cooled brownies.
Melt, and add the topping
Melt the milk chocolate chips in the microwave until fully melted. Pour overtop of the oreo truffle layer. Spread into an even layer. Add festive sprinkles overtop (if desired). Let set before slicing and serving. (Or slice and eat them while the top is still melty.. that's what I like to do!)
Notes
Store leftover brownies covered, or in an airtight container in the fridge for up to 5 days. Since we use cream cheese in the Oreo truffle layer (which is a perishable) leftovers need to be stored in the fridge. I like to add festive sprinkles to the top of the melted chocolate, you don't have to, but I think it's fun!Make Ahead: These brownies are good for up to 5 days, so they can be made several days in advance. You can also make the Oreo truffle layer a day or two in advance before making the brownies. Storing: Store leftover red velvet Oreo truffle brownies in an airtight container in the fridge for up to 5 days. Freezing: In theory I think these brownies would freeze well. You can freeze the entire pan by wrapping it tightly in plastic wrap, or slice and freeze individually wrapped brownies. I have not tested this, however, and I’m not sure how the brownie texture might be affected after thawing.