1 (approximately 22-ounce) package fudge brownie mix (Do not use mixes enhanced with chocolate syrup/chips or chunks)
2 large eggs
2 (8-ounce) packages cream cheese, softened
1/2 cup granulated sugar
1 teaspoon vanilla extract
1 cup semisweet chocolate chips, melted
Prepare a fudge brownie mix according to the package directions; pour the batter evenly into a 9-inch springform pan. Bake at 350°F (175°C) for 15 minutes.
In a bowl, combine softened cream cheese, sugar, and vanilla; mixing at medium speed with an electric mixer until well blended. Add 2 eggs, one at a time, mixing well after each addition. Pour over the brownie layer.
Spoon melted chocolate chips over the cream cheese mixture and cut through the mixture several times to achieve a marble effect. Bake at 350°F (175°C) for 35 minutes or until edges are set but center still moves slightly. Cool in pan on wire rack; refrigerate until firm.
Makes 12 servings.