Preheat your oven according to the back of the cake mix box directions.
Prepare the cake mix according to the back of the box. I like to use milk (or buttermilk) instead of the water called for, and add 1 extra egg. I feel it gives a more homemade taste.
Spray 2 pie dishes with nonstick cooking spray. Line the pie dishes with the pie pastries.
Pour the cake batter into the prepared pie crusts. Bake according to the instruction on the back of the box for 2 round cake pans.
Once the cake is done, prepare the chocolate fudge topping. Combine the butter, chocolate chips, & sweetened condensed milk in saucepan. Cook, while stirring, on medium heat until melted & smooth. Pour the chocolate fudge topping on evenly on top of the 2 pies. Garnish with chocolate chips, if desired.
Allow the pies to cool to set.
**For some extra decadence, double the chocolate fudge topping.