Blendered Cream
The fats in the butter collect in record time, in a blender, but it does not aerate. A food processor does the same thing, but takes longer. Use the blender of processor to "whip" cream if you want it to be super thick and never separate, for decorating or all day sitting at a potluck with no refrigeration.
Both the blender or processor are great ways to make butter, quickly and efficiently. Not nearly as much mess as butter in a mixer, although that's the way mom used to do it.
Kelly