Preheat oven to 350.
Whisk together cream cheese, sugar and salt until everything is well blended.
Stir in chocolate chips. Set bowl aside.
In a separate bowl, sift cocoa, flour, sugar, salt and baking soda together.
In a small bowl, mix together oil, water and vinegar together. Add the wet ingredients to the dry ingredients and whisk together well, until all lumps are gone.
Line muffin pan with baking cups. Fill each cup about half full with cake batter. Then drop 1 Tablespoon dollops of cream cheese filling into the center of each cup.
Bake for 20-30 minutes or until cake batter is done ( stick a toothpick into the edge where just the cake is. If it comes out clean, it's done. Don't stick it in the middle. The middle stays soft and gooey.)