Do not place the butter directly on top of a warm oven, unless it is frozen. Keep an eye on butter in hot places to make sure it doesn’t melt, as this can happen rapidly.
Instead of a zip lock bag, you could put the butter between two sheets of parchment paper or wax paper.
You don’t need to aim for an exact size. Try cutting a stick of butter into four or five pieces.
You can make your own double boiler by stacking two pans.
Return to the heat for thirty seconds if there are still chunks after stirring.
Note: remember to remove silverware from the bowl before returning it to the microwave.
Butter with greasy droplets or white residue on the surface has been microwaved too long. It can still be used for sautéing or adding flavor to savory dishes, but may negatively affect the texture of baked goods. [5] X Research source
