Preheat the oven:

• Preheat your oven to 350°F (175°C). Grease and line a 9×9-inch baking pan with parchment paper for easy removal of the brownies.

Prepare the brownie batter:

• In a large bowl, mix together the melted butter and granulated sugar until smooth.

• Add the eggs and vanilla extract, and beat until well combined.

• Stir in the cocoa powder, flour, salt, and baking powder. Mix until smooth and no dry spots remain.

Add chocolate chips and cookies:

• Fold in the chocolate chips and the roughly chopped cookies. You want a nice distribution of the cookie pieces throughout the batter.

Bake the brownies:

• Pour the brownie batter into the prepared pan and spread it evenly.

• Bake for 30-35 minutes or until a toothpick inserted into the center comes out with just a few moist crumbs (not wet batter). Be careful not to overbake for a fudgy texture.

Make the cream filling (optional but delicious):

• In a small saucepan over medium heat, warm the heavy cream until it starts to simmer.

• Pour the cream over the remaining cookies and gently crush them into a soft cream filling, or use the ready-made cream from the sandwich cookies.

Cool and Serve:

• Allow the brownies to cool completely in the pan. If desired, drizzle the cream filling over the top for added indulgence before serving.