1 white cake mix
1/3 cup oil
Mix together into a dough. Spread 2/3 of dough onto the bottom of a greased 9x13" pan. Set aside.
In microwave safe bowl, put:
1 can sweetened condensed milk
1 cup chocolate chips
1/4 cup butter
Microwave together for 1 minute. Stir until smooth. Pour over dough.
Take the remaining dough and crumble little pieces onto chocolate mixture. Bake at 350 for 20-25 minutes.