Marbled Chocolate Cheesecake Bars

This recipe is courtesy of "Taste of Home" magazine and is super delicious and VERY rich. Perfect for a nice dessert to bring to a party/potluck.
Ingredients:
Chocolate Batter:
3/4 cup water
1/2 cup butter
1 1/2 squares (1 1/2 ounces) unsweetened chocolate
2 cups all-purpose flour
1 1/2 cups packed brown sugar
1 teaspoon baking soda
1/2 teaspoon salt
2 eggs
1/2 cup sour cream

Cream Cheese Mixture:
1 package (8 ounces) cream cheese, softnened
1/3 cup sugar
1 egg, beaten
1 tablespoon vanilla extract
1 cup (6 ounces) semisweet chocolate chips

Directions:
1. In a small saucepan, combine water, butter, and chocolate; cook and stir over low heat until smooth. Cool. in a mixing bowl, combine flour, brown sugar, baking soda, and salt. Add eggs and sour cream; beat on low just until combined. Stir in chocolate mixture until smooth.
2. Preheat oven to 375 degrees F. In another bowl, beat cream cheese, sugar, egg, and vanilla; set aside. Spread chocolate batter into a greased 15x10x1-inch baking pan. Drop cream cheese mixture by tablespoonfuls over batter; cut through batter with a knife to swirl. Sprinkle with chocolate chips. Bake for 20 to 25 minutes or until a toothpick inserted near the center comes out clean. Cool on a wire rack.