Cookie Dough Brownies have a fudgy layer of brownie, a thick layer of cookie dough, and a chocolate glaze. So thick you might have to eat them with a fork!
Make brownies in a 9x13-inch pan according to package instructions. Let cool completely.
To make cookie dough, beat butter, brown sugar and granulated sugar with an electric mixer until combined. Beat in milk and vanilla extract. Mix in flour and salt just until combined. Stir in chocolate chips.
Spread cookie dough layer on top of cooled brownies. Refrigerate or freeze until firm.
To make glaze, place chocolate chips in a small bowl. Bring cream and butter to a simmer in a small saucepan and pour over chocolate chips. Let sit 15 seconds and then stir until smooth. Pour glaze on top of cookie dough layer.