Bake the brownies based on the package instructions in a 9X13 pan lined with parchment paper with the paper overhanging the sides of the pan.

While the brownies are baking, prepare the peanut butter layer.  In a large bowl, mix together the melted butter, peanut butter, and powdered sugar with a hand held mixer until all the ingredients are well combined.

When the brownies are done baking, spread the peanut butter mixture evenly on top of the brownies while they are still warm.

Then place the chocolate chips and heavy whipping cream in a small microwave safe bowl.  Heat in 30-40 seconds intervals in the microwave, stirring after each interval, until the chocolate is melted and smooth.

Pour the melted chocolate evenly over the peanut butter layer on the brownies.

Refrigerate the brownies for at least 2 hours so that the peanut butter layer and chocolate ganache layer can set.  Then the brownies are ready to serve when chilled and enjoyed!