Oh yes, works very well. My vegetarian friend showed me.
Use crème frâiche or cream cheese like philadelphia. Add salt to your liking and some herbs E: oh, and some garlic!
Take mushrooms, remove stems, and fill them up.
Then wrap them in aluminium foil.
They can take a lot of heat. Very forgiving, exactly what you want for the open flame. They taste very good. A shame I don't like the mouth feel of a whole mushroom.