I put a paper towel on a plate underneath the pellets, then zap for 2 minutes. Then I change paper towels, and zap for 1 minute to 1-1/2 minutes more. It is critical that you watch it during the entire process. Some microwaves can set the paper on fire if left in too long.
I find that convection oven drying is longer, but works the best. I leave the pellets in at 250° to 275° for about 20 minutes. Again, you will have shrinkage, so put in more pellets than you need.