I use this small 'Micro-cooker' from Pampered Chef - I've had it for
years and use it almost every day in the microwave. It's not a steamer
as you use no water - (but you don't need water in the microwave anyway,
or, at most, a tablespoon or so), it has little steam holes on top.
Here's a link to it on pamperedchef.com:

http://tinyurl.com/zsjsa

Sharon