Preheat the oven to 375 degrees and grease a medium jelly roll pan (I use a Pampered Chef stoneware pan - it's something like 8" x 12").
Arrange the cookies in the pan - 5 rows, 5 cookies per row. Set aside.
In a medium bowl, add the brownie mix, water, oil, and eggs. Stir until combined (I use a spatula) - about 50 strokes.
Pour the brownie batter over the cookies and spread evenly with the spatula. I had too much batter (about a cup) that I made separately in a small pan.
Bake for 18-20 minutes or until a toothpick inserted in the brownie portion comes out clean.
Once done, remove from the oven and immediately sprinkle the chocolate chips evenly over the brownie. Let them melt for about 3 minutes then spread the chocolate over the top. It should spread easily if you let them melt enough. Once spread evenly, sprinkle the crushed peanuts over the top.
Let cool and then slice into bars. I popped mine into the fridge to set up quicker and they sliced easily.