Per heat oven to 350. Place half the pkg of cookies in ziplock bag,and smash up. Mix together the cake mix. Add in the vanilla extract. Then add in 1/2 the smashed up cookies. Pour in baking pan and bake for about 25 to 30 mins. Then let fully cool.
In a meduim bowl mix vanilla frosting with the other half of the smashed up cookies. Once cake is fully cooled frost cake. For extra touch take 2 cookies, cut in half & place on top in the center for deco.