4 Portobello mushrooms 2 tablespoons olive oil 3 teaspoons oregano 2 tablespoons balsamic vinegar Salt and pepper to taste - See more at: http://www.healthylivingwithsandy.com/portobello-steaks#sthash.cUW9UzHA.dpuf
Preheat oven to 350 degrees.
Cut off mushroom stems and wash both tops and stems.
Mix oil, oregano and balsamic vinegar in a small bowl.
Place mushroom tops and stems in a baking dish with an edge.
Pour oil mixture over mushrooms and bake for 30 minutes.