Preheat oven to 350 degrees F. Grease a 9 x 9 pan and set aside.
In a mixing bowl combine cake mix, oil, water and egg. Batter will be thick. Spread batter evenly into prepared pan. Sprinkle with crushed cookies over the top of the batter, gently pressing into the batter.
Bake 25 - 30 minutes or until a toothpick inserted in center comes out clean.
Once cool, make the glaze and drizzle over the bars. Cut into squares and serve.