Clean mushrooms with a dry paper towel, wipe off any dirt. Do not run under water or they will become soggy and yucky. Thinly slice each mushroom.
Melt butter on medium heat in a large frying pan
Add sliced mushrooms and sprinkle with salt and pepper
Saute for about 5 -10 minutes or until mushrooms and thoroughly cooked
Sprinkle with fresh thyme
Serve immediately