Preheat oven and prepare cake mix according to box directions. Grease and flour cupcake pan and and fill cups 2/3 full. Cream softened cream cheese together with sugar. Beat in egg and salt. Stir in chocolate chips. Drop one rounded teaspoon of cheese mixture into each cup. The cake will bake up around the cheese. Bake as directed for cupcakes on the cake mix box. Cool and frost with desired frosting or powdered sugar.