Brownie Batter:
6 Tbsp. unsalted butter
4 oz. bittersweet or semi-sweet chocolate
2/3 cup sugar
2 large eggs, room temperature
1/2 cup flour
1 Tbsp. unsweetened cocoa powder
1/8 tsp. salt
1 tsp. vanilla extract
In a saucepan, melt the butter and chocolate over low heat, stirring until smooth. Remove from heat and beat in the sugar, then the eggs.
In a medium bowl, mix flour, cocoa powder and salt. Stir in chocolate mixture, then add 1 tsp. vanilla and chocolate chips (if using). Spread evenly in the prepared pan.
Cream Cheese Filling:
8 oz. cream cheese, room temperature
1 large egg yolk
5 Tbsp. sugar
1/8 tsp. vanilla extract
In a separate bowl, beat together the cream cheese, egg yolk, 5 tbsp. of sugar, and 1/8 tsp. vanilla until smooth.
Distribute the cream cheese mixture in eight or nine dollops across the top of the brownie mixture
take a dull knife or spatula and gently swirl the cream cheese mixture with the chocolate batter.
Preheat oven to 350 F. Lightly grease a 9-inch square baking pan.
Bake in preheated oven for 35 minutes, or until the batter in the center of the pan is just set. Let cool and cut into squares.
Makes a 9x9 pan of brownies.
Recipe found here http://www.ahintofhoney.com/2010/06/cheesecake-brownies.html