Preheat your oven and grease a 13×9‑inch baking pan (or line it for easier removal).

Prepare the brownie mix according to the package directions, pour into the greased baking pan, bake until done, then allow it to cool completely.

While the brownies cool, prepare the peanut butter layer: in a large microwave‑safe bowl, melt the ½ cup butter together with the 1 cup creamy peanut butter (30‑60 seconds on high, stirring once the butter is melted). Then stir in the 2 cups confectioners’ sugar until smooth. Evenly layer the mixture on top of the cooled brownies.

Next, make the chocolate topping: in another large microwave‑safe bowl, melt the remaining 6 tablespoons butter with the 6 ounces chocolate chips. Microwave in 30‑second increments, stirring between each interval until the mixture is fully melted and smooth. Spread this over the peanut butter layer.

Let the brownies cool (you may refrigerate them to set faster) until the topping is firm, then cut into squares and serve.