Preheat the oven to 350 degrees Fahrenheit.
Prepare a baking pan with baking spray and set aside.
In a bowl, beat the butter and sugar together.
Add in the eggs and vanilla and mix until blended.
Use about 3-4 drops of red food dye and mix. Start with less or add more if needed, you are looking for a bright red color in your batter, as the cocoa powder will darken the color.
Add the oil, salt, and cocoa powder and mix again.
Pour in the flour and fold together until completely incorporated
Add ¾ of the chopped Oreos into the red velvet brownie batter.
Pour the batter into the prepared baking pan and place the rest of the Oreo pieces on top in an even layer.
Place in the oven for 45 minutes or until you place a toothpick into the batter and it comes out clean.
Let cool for at least 20 minutes and then cut into pieces.
Store by covering with plastic wrap or place cut pieces into a tightly sealed container.