Slowly melt 8 ounces of chocolate in a microwave safe bowl or double broiler. Stirring frequently.
Take the melted chocolate off the heat and add the reminding 4oz of chocolate. This will help cool the chocolate so that your peanut butter doesn't melt.
Line a cookie sheet with wax paper and add peanut butter to your Ritz crackers.
Dip and turn your peanut butter crackers in chocolate and remove with a fork, scraping the bottom of the fork on the side of the bowl to remove the excess chocolate.
Place on wax paper.
Once done with dipping your cookies, place in refrigerator to fully cool.
Using only 2 ounces of the white chocolate, place in microwave safe bowl and slowly melt.
Using a fork, drizzle on top of your chocolate covered Ritz cookies.
Allow to cool.