Mix brownies up according to package instructions.
Add chocolate chips to the brownie batter and spread in a greased 9x13 inch pan.
Heat peanut butter in microwave for 10-20 seconds or until it is a pourable consistency.
Pour the peanut butter over the brownie batter in vertical lines. Drag a toothpick or knife through the peanut butter lines to make swirls of peanut butter through the brownie batter.
Press the RITZ crackers into the batter lightly.
Bake according to package instructions or until a toothpick stuck into the middle comes out clean.