2 1/2 cups crushed Oreos. (Take the frosting out of about 8 of the Oreos)
Preheat oven to 350ºF and line two pans of cupcake pans with liners.
In a mixing bowl, beat together the cake mix, oil, eggs, water and vanilla. Beat for about 2 minutes, or until nice and creamy. Add the Oreo crumbs and beat until well combined.
Divide the batter amongst 24 cupcake liners.
Bake for about 20 minutes, or until lightly browned, and a toothpick inserted in the middle comes out clean.
Allow to cool for 5 minutes in the pan before removing to racks to cool completely before frosting.
To make a layer cake, divide the batter between two pans and adjust the cooking time to 25-30 minutes.