Cooking: Melting White Chocolate:

The different fats in true white chocolate melt at different temperatures, so the best method of melting, especially in the microwave is to melt only 8 ounces at a time and at short intervals, stirring frequently to ensure an even melt. Note: When you remove it from the microwave, it will retain its shape. Don't be fooled! Stir it with a fork to see where it is.