Mix up the brownies according to the instructions on the package.
Pour the mix into a greased baking dish.
Heat the peanut butter in the microwave for 10 seconds so it becomes runny, then pour it over the brownie mix and drag a knife back and forth through the mix to swirl the peanut butter in.
Place peanut butter brownies in the oven and bake for 20 minutes.
Remove the partially cooked brownies from the oven and sprinkle half of the M&M's® Crispy over them.
Roll out the chocolate chip cookie dough and press the M&M's® Crispy into it. Then place the cookie dough on top of the brownies.
Put the baking dish back in the oven and bake for an additional 20-25 minutes or until a toothpick is inserted and comes out clean.
Remove from the oven and let cool. Then cut and serve.