The International Journal of Food Sciences and Nutrition published a study to explore the effect of different cooking methods on the nutritional value and antioxidant activity of cultivated mushrooms.

You can see a summary here.
(Please Note: To read the full report you will have to pay.)

The Two Best Ways to Cook Mushrooms:

  1. Microwave them
  2. Grill them

The BBC have given their summary of the study in the Health section of their website.

http://www.bbc.co.uk/news/health-39998669 

We are pleased to see mushrooms being promoted in this way. They really are great for nutrition.

Check out all the nutritional benefits of mushrooms here.