Heat oven to 375 degrees.
Grease and flour bottom and side of 8inch round pan.
Beat flour, sugar, butter, water, baking soda, egg, and chocolate in medium bowl with electric mixer on low speed 30 seconds, scraping bowl constantly.
Beat on medium speed 1 minute, scraping sides occasionally.
Stir in broken cookies. Spread in pan.
Bake 25 to 30 minutes or until cake springs back when touched lightly in center.
Cool 10 minutes; remove from pan to wire rack.
Cool completely, about 1 hour.
Cut cake horizontally in half.
Place bottom layer on serving plate.
Spread with frosting and top with remaining layer.
Place chocolate chips and shortening in small microwavable bowl.
Microwave uncovered on high 10 to 15 seconds or until chocolate can be stirred smooth and is thin enough to drizzle.
Drizzle chocolate over top of cake.
Sprinkle with the coarsely broken cookies.