Baked Portabella Mushrooms
With Balsamic Vinegar and Rosemary

October 15: National Mushroom Day
We had a small blessing for our first house we ever purchased in Illinois. On our invitation, we stated “no gifts, please—your presence is a present”. But our new friends did not want to show up empty-handed and brought over food to share anyway! What a blessing in more ways than one, as we came to realize they all liked to cook, too.
Then-future Methodist minister Lynnie H. made portabella mushrooms in a balsamic vinegar rosemary marinade and baked them in our house while our other guests helped us set up the table. We never had this dish before, and it was nice for our other friends to try something new. It is simple and savory and perfect for potlucks and on National Mushroom Day!
Recipe
(From Lynnie H.)
Ingredients
- 3 large portabella mushrooms
- 3 tablespoons olive oil
- 3 tablespoons balsamic vinegar
- 1 teaspoon dried rosemary
- Salt and pepper to taste
- Fresh parsley leaves, chopped (optional garnish)
Directions
Gently wash the mushrooms and dry with paper towels. Remove the stems. Scrape off the gills (see Notes). Slice half inch thick. Set aside. In a large mixing bowl, combine the olive oil, vinegar, rosemary, salt and pepper.

Toss the mushroom slices in the bowl and coat well. Line a lipped baking sheet with foil and mist with cooking spray. Place the marinated mushrooms on the sheet but do not overlap the slices. Bake in a preheated oven at 400 degrees F for 10 minutes. Remove from the oven and turn the slices on the other side and return to the oven for another 5-10 minutes. Remove from the oven and transfer to a platter. Garnish with chopped parsley. Serve immediately.

Notes
- Portabella gills are edible but if left on, they leave darker juices. We do not mind the gills. To remove the gills, first snap off the stem. Then use a spoon to gently scrape off the gills. Learn more about how to remove the gills from the World Society for Mushroom Biology and Mushroom Products.
- Search our blog for more recipes containing mushrooms as an ingredient.




