Ideas for Portabello mushrooms

Marinate and grill them.
Roast them: Oven 450. Grease a cookie sheet. Slice mushroom into ½” strips and place on cookie sheet; drizzle with olive oil, fresh garlic, salt & pepper. Bake 8-10 minutes or til cooked.
Saute them: Slice mushroom into 1/2 “ strips, and cook in a frying pan in 1-2 tbsp of butter until tender. Serve with grilled chicken over pasta.

Also, check out this website for recipe ideas: http://www.foodnetwork.com/search/portobello+mushroom/results.do?fnSearchType=recipe