Step 1

Preheat oven to 350 degrees F.

Step 2

In a large bowl, combine the cake mix and butter until tiny crumbs form. Use a pastry blender or your fingers.

Step 3

Spray the sides of a 9 x 13 glass baking dish with nonstick spray.

Step 4

Press the cake mix/butter mixture into the bottom of the pan, smoothing it out, and making it as even as possible.

Step 5

In layers, sprinkle the chocolate chips, butterscotch chips, and walnuts.

Step 6

Drizzle the can of sweetened condensed milk over entire pan.

Step 7

Bake for 25 minutes.

Step 8

Cool completely. Cut into bars.