Preheat the grill to medium high.

Separate the mushrooms from the stems.

With a mushroom brush or a damp towel, clean the top surface of the mushrooms.

Brush or spray the mushrooms with extra virgin olive oil.

Arrange the mushrooms on the grill rack and grill for 3 - 5 minutes.

Flip the mushrooms and cook for an additional 2 - 4 minutes, depending on the thickness of rat mushrooms.

Remove to a plater, season with salt and freshly ground pepper.

Sprinkle the parsley on top and serve immediately.