1 pound cremini mushrooms (or baby portabella), cleaned and quartered
1 medium shallot, minced
2 tablespoons extra-virgin olive oil
2 tablespoons white wine vinegar
1 tablespoon dried oregano
2 tablespoons finely chopped fresh parsley leaves
Bring a saucepan with salted water to a boil. Add the mushrooms and simmer until tender, about 5 minutes. Once the mushrooms are cooked, drain the water.
Toss the warm mushrooms with the minced shallot, olive oil, white wine vinegar, oregano, and parsley. Cover the bowl and let the mushrooms marinate in the refrigerator for a couple hours, or to up to 1 week. When you are ready to serve, remove the mushrooms from the fridge about 30 minutes prior to serving.