Superb Sauteed Mushrooms

In a large saucepan heat olive oil and butter. Once butter has started to melt add mushrooms. Add each addtional ingredient stirring occasionaly. Taste as you go to ensure it is to your liking. Once mushrooms and sauce begin to cook reduce heat to low and simmer until mushrooms are tender but not soggy. Serve over grilled steak. Also excellent over baked potatoes.