Marbled Chocolate Bars

Prepare cake batter according to package directions. Pour into a greased 15 inch x 10 inch x 1 inch baking pan. In a small mixing bowl, beat cream cheese and sugar. Stir in 1/4 cup chocolate chips. Drop by tablespoonfuls over batter. Cut through batter with knife to swirl the cream cheese mixture. Spinkle with remaining chocolate chips.
Bake at 350 for 24 - 30 minutes or until a toothpick inserted near the center comes out clean. Cool on a wire rack. Cut into bars.

Makes 3 dozen