I was taught by a chef to put them in a freezer bag and seal the end and put in micro for 1 and half minutes - I don't like the plastic bag idea but I do use it when I am in a hurry! So would be ok short term given most bowls used in the micro are plastic anyway
You can also buy the microwave bags at the supermarket that are made for microwave steaming - if you are inspired, when you buy your veg cut them all up etc and put them in the bags and then freeze them, ready for cooking