Wrap each corn on the cob in (microwave suitable) plastic wrap to seal completely.
Microwave on HIGH (full power) for 2 1/2 minutes.
Turn corn over 1/2 turn and continue to microwave on HIGH (full power) for another 1 1/2 minutes.
Remove from microwave and let rest for about 2 to 3 minutes.
Using a sharp knife, slice the plastic wrap, being very careful when you remove the wrap because of the steam.
Serve with butter and sprinkle with salt if desired.
If you are microwaving 2 corn on the cob at the same time, Microwave on HIGH (full power) for 3 minutes. Then turn the corn over 1/2 turn and continue to Microwave on HIGH (full power) for another 2 1/2 minutes, then let rest for 2 to 3 minutes.
Yellow corn is also very good if it is nice and young and not old kernels unless you prefer old corn.