Filled Cupcakes

1 cake mix (any flavor)
1 - 8 oz. cream cheese
1/3 cup sugar
1 egg
1 - 6 oz. bag chocolate chips

Prepare cake mix according to directions, then set aside.
Mix cream cheese, sugar, egg, and chocolate chips in a small bowl.
Fill cupcake tins 2/3 full with cake mix. Drop in 1 teaspoon of cheese filling into each tin.
Bake according to cake mix directions.