The method I do is first I use a water mister to lightly spray the food, cover it, then heat for:

1/2 the original recommended time at full power

1x the recommended time at half power

Let it sit for 30 seconds.

Ex: Says to heat for 2 minutes

1 minute full power

2 minutes at half power

Many microwaves have a method to enter two times and power levels at the same time so you don't have to get up to change the power level.

Doing this, the food typically comes out pretty evenly heated and without significant dry spots.

You can buy the non-metal covers hotels use for their plates online or at a restaurant supply store. Last a lot longer than the crappy plastic covers that are sold as microwave food covers. They're also easier to clean.

The extra moisture from the mister and the cover with a minimal hole helps trap the heated water vapor which should keep the food from getting dried out and help distribute the heat better.

Adjust for you microwave power and how transparent to microwaves your plate cover is. Once you dial it in, it should be the same adjustment for the microwave (ex I add 6 seconds for every minute on mine)

The whole train to use a microwave is that it's fast.

If I'm going to be doubling the time, I'd might as well just pull out the stove or the oven and do it right for just a bit more time.

A misconception about microwaves is that they need around 1000W to actually do sonething, anything lower than 800 makes the waves completely ineffective. When you turn your microwave to 500W, what it actually does is lie to you while microwaving only half of the time instead by cycling on and off. You can usually hear this change in the sound it makes cause it will switch between the 1kW and the ventilator. 🙂