Marbled Chocolate Cheesecake Bars

Ingredients
3/4 cup water
1/3 cup butter
1 1/2 (1 ounce) squares unsweetened chocolate
2 cups all-purpose flour
1 1/2 cups packed brown sugar
1 teaspoon baking soda
1/2 teaspoon salt
1 egg
1 egg white
1/2 cup reduced-fat sour cream
CREAM CHEESE MIXTURE:
1 (8 ounce) package reduced fat
cream cheese
1/3 cup sugar
1 egg white
1 tablespoon vanilla extract
1 cup miniature semisweet chocolate chips

Directions
In a small saucepan, combine the water, butter and chocolate. Cook and stir over low heat until melted; stir until smooth. Cool.
In a large mixing bowl, combine the flour, brown sugar, baking soda and salt. Add egg, egg white and sour cream; beat on low speed just until combined. Stir in chocolate mixture until smooth. In another mixing bowl, beat cream cheese, sugar, egg white and vanilla; set aside.
Spread chocolate batter into a 15-in. x 10-in. x 1-in. baking pan coated with nonstick cooking spray. Drop the cream cheese mixture by tablespoonfuls over batter; cut through batter with a knife to swirl. Sprinkle with chocolate chips.
Bake at 190 degrees C for 20-25 minutes or until a toothpick inserted near the center comes out clean. Cool on a wire rack.