Place the cookie dough between two sheets of waxed paper or parchment paper and roll it out until it is the same thickness as the chocolate chips. Try to keep it in as much of a rectangle or square as you can.
Spread a thick layer of the brownie dough evenly over the dough, going all the way to the edges except on the top one inch. You probably won't use the entire batch of brownies for this step.
Carefully roll the dough, starting from the bottom. You'll likely have some of the brownie batter squish out a little.
Once you complete the roll, gently press to seal the roll, wrap it in the waxed/parchment paper, and place it in the freezer for at least 30 minutes so it sets up.
Preheat the oven to 375 degrees.
Unwrap the roll and slice it into about 1/4-inch slices. Place them two inches apart on a cookie sheet lined with parchment paper.
Bake for 10 to 15 minutes or until the cookies are golden brown.
Let the cookies cool for a few minutes before transferring to an airtight container.