Preheat oven to 350 degrees.
1 box chocolate cake mix (it's best with a chocolate cake mix, but you could also use a Butter or Yellow cake mix as well)
1 small box milk chocolate instant pudding (3.9 oz)
1 cup sour cream
1 cup oil
1/2 cup water
Beat for 2-3 minutes at medium speed
Stir in 9 oz chocolate chips (semi-sweet or milk chocolate)
Bake at 350 for one hour, but check after 50 minutes. I have used two 9-inch round pans to make a layer cake, and I have also used a bundt cake pan and that works too. If you make a layer cake, use any frosting you choose and put goodies both in between the layers and on top. For a bundt cake, mix your goodies with your frosting and pour over a completely cooled cake.
**Goodies can be whatever you choose. A couple of yummy ones are Cracklin' Oat Bran, crushed Snickers, crushed Heath Bar, Hershey's Hugs (save some to sprinkle on top of the frosted cake), candy bars, etc.
Note: If you use muffin tins, bake 24 muffin liners for 23-27 minutes.