Cheesecake-Marbled Brownies

Brownie batter

• 1 stick(1/2 cup)   unsalted butter, cut into pieces
• 2 oz                       unsweetened chocolate, chopped
• 1 cup                     sugar
• 2 large                  eggs
• 1/2 teaspoon       pure vanilla extract
• 2/3 cup                all-purpose flour
  

Cheese cake batter

• 8 oz                      cream cheese, well softened
• 1/3  cup               sugar
• 1  large                egg yolk
• 1/4  teaspoon     pure vanilla extract

Make Brownie batter:

• Put oven rack in middle position and preheat oven to 350 F
  
• Butter an 8-inch quart baking pan
• Heat butter and chocolate in a 3-quart heavy saucepan over moderately low heat, whisking occasionally, just until melted. 
• Remove from heat and whisk in sugar, eggs, vanilla and a pinch of salt until well combined. 
• Whisk in flour until just combined and spread in baking pan. 

Make Cheesecake batter and Bake Brownies:

• Whisk together cheesecake batter ingredient in a small bowl until smooth. 
• Dollop over brownie then swirl in with a knife or spatula.
• Bake until edged are slightly puffed and center is just set, about 35 minutes. 
• Serve with warm or room temperature.