Preheat oven to 350 degrees F (175 degrees C). Spray a 9x13 inch pan with cooking spray. In a large bowl, combine chopped cookies, chocolate chips, flour and margarine. Set aside.
Mix cake according to directions on package.
Pour half of cake batter in pan.
Sprinkle approximately 2 cups of the cookie mixture on top.
Pour rest of cake batter over layer of cookies.
Sprinkle remainder of cookie mixture on top.
Bake at 350 degrees F (175 degrees C) for 40 to 45 minutes, or until toothpick inserted into center of cake comes out clean.
To make the glaze: In a small bowl, mix 1 cup confectioners' sugar with 2 to 3 tablespoons milk.
