Cream together your butter and sugar, using a hand mixer, or stand mixer with its paddle attachment. Add the vanilla, then each egg individually, giving time for the each egg to incorporate fully.
Add your food coloring. Remember that you'll be fighting against the darkness of the cocoa powder, so start with 4 drops and add more if your red needs more pop.
Add the oil, salt, and cocoa powder, then add your flour. Be careful not to overmix the batter when you add the flour mixture. Mix it until the flour is just incorporated.
Take your bowl off of the mixer, and use a rubber spatula to carefully fold in most of your crushed Oreo pieces.
Pour the batter into a prepared pan, place the rest of your Oreo pieces on top, and then pop it into your preheated oven. After 45 minutes, take them out, let them cool, and enjoy.
