½ cup butter, softened
¾ cup brown sugar, tightly packed
¼ teaspoon salt
1 teaspoon vanilla extract
2 cups all-purpose flour
14 oz. sweetened condensed milk
2 cups mini chocolate chips
1 cup smooth peanut butter
½ cup powdered sugar
12 ounces milk chocolate chips
½ cup heavy cream (optional)
Spray a 9x9 baking pan with nonstick cooking spray and line with parchment paper.
Make the cookie dough layer by using a hand mixer to cream together butter and brown sugar in a mixing bowl. Mix in salt and vanilla. Slowly mix in flour and sweetened condensed milk, alternating between the two. Stir in mini chocolate chips. Press the dough into the prepared baking pan.
Make the peanut butter layer by using a hand mixer to cream together peanut butter and powdered sugar in a mixing bowl. Gently spread the peanut butter mixture over the cookie dough layer.
To make the top layer, you can either just sprinkle the chocolate chips on top or create a chocolate ganache by pouring the chocolate chips into a microwave safe bowl. For a softer chocolate layer, pour in heavy cream (optional). Microwave in 15 seconds intervals, stirring in between, until chocolate is smooth and melted. Pour over peanut butter layer immediately and smooth out with a rubber spatula.
Refrigerate for 4 hours before slicing and serving.