Marbled Cheesecake Brownies

Ingredients

Brownies: 

• ¼ cup unsalted butter
• 6 ounces semi-sweet chocolate chips
• 3 large eggs
• ½ cup white granulated sugar
• ¼ cup light brown sugar
• ¼ teaspoon salt
• ½ cup all-purpose flour

Cream cheese mixture: 

• 4 ounces cream cheese, at room temperature
• ¼ cup sugar
• 1 large egg yolk
• ¼ teaspoon pure vanilla extract

Instructions

1. 1
   Preheat the oven to 350 degrees. Grease a 8 x 8-inch or 9 x 9-inch brownie pan and line it with a sheet of parchment, leaving some extra parchment on either side; this will help with removing the brownies. In a glass or stainless steel bowl, nestled in a saucepan with simmering water, add the butter and chocolate chips. When melted, about 5 minutes, stir until very smooth. 
2. 2
   To a medium bowl, add the eggs, white granulated sugar and brown sugar; whisk until it turns a pale brown color, about 5 minutes. Add the melted chocolate and mix. Stir in the salt. Fold in the flour and mix just until combined. 
3. 3
   Pour the batter into the prepared brownie pan. In a medium bowl, whisk together the cream cheese, sugar, egg yolk and vanilla extract. Drop a few dollop onto the surface of the brownie batter and then using a skewer, run it through, creating a swirling patter.
4. 4
   Repeat any remaining cream cheese mixture. Transfer to the oven to bake for 25 to 30 minutes, until the top is set and the edges pull away from the pan. Allow to cool completely in the pan; run a knife along the edges and lift up the excess parchment. Cut the brownies into squares.