Cookie Dough Stuffed Brownies

Name: Cookie Dough Stuffed Brownies
Prep time: 30 min
Cook time: 45 min
Total time: 1 h 15 min
Cuisine: American
Ingredients: 113g or 1/2 cup unsalted butter (at room temperature ); 105g or 1/2 cup light brown sugar; 1 tsp pure vanilla extract; 1/2 teaspoon fine sea salt; 80g or 1/2 cup plus 2 tablespoons all purpose flour; 1/2 cup mini chocolate chips (80g); 1/4 cup sweetened condensed milk (75g); 180g or 3/4 cups unsalted butter; 300g or 1 1/2 cups granulated sugar; 75g or 3/4 cup dutch process cocoa; 1 teaspoon fine sea salt; 2 teaspoons pure vanilla extract; 3 large eggs; 1/4 cup plus 3 tablespoons all purpose flour; 150 g dark chocolate, OPTIONAL (55-70% cocoa solids, chopped or ground in a food processor )