Melt chocolate over a low heat. You can use a double broiler or microwave (I heated the 1st cup in a small microwave bowl for 30 seconds and pull the bowl out the microwave). Add 1 more cup white chocolate, stir it then put it in the microwave for another 30 seconds. Then add 1 tablespoon of shortening.
Dip each cookie into white chocolate then add sprinkles. Place dipped cookies on a baking pan covered with waxed paper and place in fridge for at least 30 minutes