With olive oil pan fried button mushroom for about 3 minutes then turn over for another 3 minutes then off heat, season with salt and black pepper (or optional szechuan peppercorn salt)and spring onion.
https://cookpad.com/us/recipes/365283-szechuan-peppercorn-salt
https://cookpad.com/us/recipes/341919-mushroom-with-rosemary