Place the nuts in an even layer on a microwave-safe plate or dish (a glass pie plate works well).
Microwave for 1-minute intervals, removing the plate and tossing in between (plate will be hot so take care!), until the nuts are sizzling, golden, and toasted. The exact time will depend on microwave power/watts as well as the type/size of the nuts.
Notes
Time: in my microwave, it takes about 6-7 1-minute intervals to toast slivered almonds and pecan pieces and slightly less time for sliced almonds. Watch the time carefully as each microwave may vary! Rumor has it you can toast coconut this same way.