Preheat oven to 350°
Line a 9×13 inch baking dish with aluminum foil. Spray with nonstick cooking spray.
In a large bowl, use an electric mixer to beat together cake mix, eggs and 1/2 cup melted butter. Mix until smooth.
Press red velvet mixture evenly into baking dish. Bake for 15-18 minutes. You want the brownies to be just set. You don’t want to overcook these brownies!
Crush Oreos in a food processor, or by placing them in a zip top bag and crushing with a rolling pin. You want them to be fine crumbs.
Combine crushed Oreos and 1/2 cup melted butter and mix well.
Pour Oreo mixture over brownies and press gently in an even layer.
Place milk chocolate chips in a medium sized bowl.
Bring heavy whipping cream to a low boil, then pour over chocolate chips.
Let chips and whipping cream sit for 5 minutes, then whisk to combine until smooth and thick.
Pour ganache over the Oreo layer.
Finally, top with mini chocolate chips.
Place in refrigerator for 45 minutes – 1 hour to allow ganache to set up.