I do the same thing only I place the whole cookie in my food processor a few seconds to get a crumble and mix that in my butter cream. I break a couple cookies by hand to get a larger broken cookie to toss in as well.
What type of cake will go well with this????
I am going to make a white buttercream frosting add the crushed oreos. Frost a chocolate cupcake, top with a mini oreo and drizzle with melted chocolate.