12tablespoons(168g)butter, 1 1/2 sticks, melted and cooled slightly
1cup(212g)packed light brown sugar
½cup(106g)granulated sugar
1largeegg
1largeegg yolk
2teaspoonsvanilla extract
2 ⅛cups(302g)all-purpose flour
½teaspoonsalt
½teaspoonbaking soda
2cups(340g)chocolate chips
Cheesecake Filling:
8ounces(227g)cream cheese, softened
½cup(57g)powdered sugar
1largeegg
½teaspoonvanilla extract
Instructions
Preheat the oven to 350 degrees F. Line a 9X13-inch pan with aluminum foil and lightly coat the foil with nonstick cooking spray. Set aside.
For the cookie layer whisk the melted butter and sugars in a large bowl until combined. Add the egg, egg yolk, and vanilla and mix well. Add the flour, salt and baking soda, folding into the dough with a rubber spatula; do not overmix. Fold in the chocolate chips until combined. Press half of the dough onto the bottom of the prepared pan. It will be a thin layer, so use lightly moistened hands to press the dough into a thin even layer, filling in any holes with a bit of cookie dough from the bowl.
For the cheesecake filling, mix the cream cheese and powdered sugar together with an electric mixer on medium-high until light and fluffy, 1-2 minutes. Add the egg and vanilla and mix until well combined. Spread the cheesecake filling over the layer of cookie dough in the pan.
Using the remaining cookie dough, flatten tablespoon sized amounts of cookie dough in your hands into flat disc shapes, about 1/8- to 1/4-inch thick. Place these discs over the top of the cheesecake layer, pressing very lightly to adhere them to the cheesecake layer. It's ok if there are small spaces; the entire top doesn't need to be completely covered just make sure it is mostly covered with cookie dough.
Bake the bars for 35-40 minutes until very lightly browned on the edges. Remove to a wire rack to cool completely. Refrigerate until chilled, 1-2 hours. Cut into squares and serve. Store covered in the refrigerator for up to 2 days.