Even as I add this recipe, the mushrooms are in the fridge marinating! I think they will be delicious!

Ingredients

1 pound cremini or white mushrooms (or any kind you choose)
1/4 cup olive oil
1/4 cup white wine vinegar
1/4 cup diced red onion
2 cloves garlic, minced
2 teaspoons brown sugar, packed
1/2 teaspoon dried oregano
1/2 teaspoon whole black peppercorns
1/4 teaspoon crushed red pepper flakes, optional
1 bay leaf
Kosher salt and freshly ground black pepper, to taste
2 tablespoons chopped fresh parsley leaves

Directions

In a large pot of boiling salted water, cook mushrooms just until tender, about 3-4 minutes; drain well.
In a large bowl, combine mushrooms, olive oil, vinegar, red onion, garlic, sugar, oregano, peppercorns, red pepper flakes and bay leaf; season with salt and pepper, to taste.
Transfer to an airtight container and place in the refrigerator for at least 8 hours and up to 5 days.
Serve at room temperature, garnished with parsley, if desired