this is a wonderful easy way to dress up brownies.
I use the one bowl cake brownie method. So far I have used Oreo cookies, peanutbutter Oreo cookies, and i have also used mint wafers adding a quarter teaspoon mint extract. For an extra fancy and extra sweet treat, I have also iced the brownies with creamcheese frosting, adding some of the chopped or crushed cookies to the frosting.
My co-workers love them and I am asked to make the brownies for them to take home.