Candy Bar Brownies

Mix cake mix with melted butter or margarine and condensed milk. Spread out 1/2 of the mixture into a 9 x 13 inch pan.
Bake at 350 degrees F (175 degrees C) for 10 minutes.
Slice candy bars into little slices. Lay these on top of the baked crust. With the remaining batter-crumble it on top of the candy bars. It will have a crumbly texture. No need to spread it on top to make it smooth.
Put it back into the oven and bake it for another 20 minutes.