12 oz. semi-sweet chocolate chips
1/4 cup butter
2 cups Bisquick baking mix
14 oz. sweetened condensed milk
2 eggs
1 1/2 teaspoons pure vanilla
1 cup nuts, chopped
8 oz. cream cheese, softened
1/3 cup sugar

Preheat oven to 350°F.

In large saucepan, over low heat, melt 1 cup chocolate chips with butter.

Beat in Bisquick mix, sweetened condensed milk, egg and vanilla. Stir in nuts and remaining chocolate chips.

Reserving 1 1/4 cups of batter, spread remainder in a well-greased 13x9-inch pan.

In a small mixing bowl, beat cheese, sugar, remaining egg and 1/2 teaspoon vanilla until smooth. Spread over chocolate batter.

Drop chunks of the chocolate batter over the cheese mixture. Using a spatula, gently swirl through the batters to create a marble pattern.

Bake for 30 minutes or until brownies begin to pull away from the sides of the pan.