Step 1

Preheat the oven to 350 degrees F.

Step 2

Thoroughly spray a 9x13-inch baking dish with cooking spray.

Step 3

Place the sandwich cookies in a single layer in the bottom of the dish.

Step 4

Pour the condensed milk over the sandwich cookies

Step 5

Spoon the frosting over the sandwich cookies, then spread it out evenly.

Step 6

Pour the cake mix in an even layer over the frosting.

Step 7

Evenly place the butter chunks on top of the cake mix.

Step 8

Bake the cake for 40 minutes.

Step 9

Transfer the cake from the oven and scatter the candy bar pieces on top.

Step 10

Allow the cake to cool for 1 hour.

Step 11

Slice and serve.