In a bowl mix the brownie mix as directed. Add the peanut bitter chips in the batter. In another bowl mix the cookie mix as directed (omitting the egg). Add the semi-sweet chocolate chips to the batter.
Spray an 13x9 baking pan with non-stick spray. Spread the brownie batter into the pan. Take the peanut butter batter and drop spoonfuls over the brownie batter. Take a butter knife and swirl the two batter together causing a marble affect.
Bake for 35-40 minutes until a toothpick is inserted and comes out almost clean. Be careful not to over bake. It is better if it is just a tad bit under done. Let cool and cut into bars.