Preheat oven to 325 degrees F. Combine cake mix, melted butter, egg, water, and vanilla extract and mix well until thoroughly combined (2-3 minutes on medium of electric mixer).
Spray a 9×13 (or any size you have, it will still work) with nonstick spray. Pour in red velvet brownie batter.
Bake for 18-22 minutes or until a toothpick inserted comes out clean (ovens vary so watch closely).
Crush package of Oreos in a food processor (or in a large plastic bag and rolling pin).
Melt cream cheese for 15 seconds in a microwave to soften.
Stir together crushed Oreos and cream cheese until blended smooth.
Carefully spread out Oreo truffle mixture on top of baked red velvet brownies. Use your hands to help press it down instead of spreading to avoid tearing the brownies.
Melt chocolate candy bark and pour over top Oreo truffle layer.
Sprinkle with mini chocolate chips while still warm.
Let cool competely before cutting into squares.