My local paper ran a recipe for making sh**ake mushrooms that taste like bacon. You slice about 6 oz of fresh sh**ake mushrooms 1/8 in. thick. Marinate for ten minutes to one hour in 1 1/2 cups soy sauce and 1 tbsp olive oil. (I marinated mine for close to an hour and I think they came out a little salty. Next time I will only marinate for half an hour.) Drain and spread mushrooms in a single layer on a cookie sheet (line the cookie sheet with aluminum foil for easier clean up) and bake at 400 degrees for about ten minutes or until most of the moisture is cooked out of the mushrooms (they will shrink up quite a bit).
I wouldn't say they taste exactly like bacon, but the flavor is surprisingly reminisicent of bacon.