Heat Oven to 350 degrees
Spray 9 X 13 Rectangular Pan with Cooking Spray
In Mixer, beat, cake mix, oil and eggs. Spread into pan. Do not use box directions.
Bake 25 minutes and set aside to cool completely.
In Medium Bowl, mix powdered sugar, softened butter, milk, and vanilla and spread over brownies.
Place cookies in a baggie and hit with the bottom of a cup, or rolling pin. Sprinkle with Chopped Cookies, slightly press into frosting.
Place Chips in separate bags and heat in microwave for 30 seconds at a time, until melted.
Drizzle each flavor over sandwich cookies.
Refrigerate before cutting.