Caramelized Onion Stuffed Portobello Mushrooms

INGREDIENTS

large portobello mushroom caps

Cooking spray

2 tbsp

olive oil

medium Vidalia onions or sweet onions, thinly sliced

1 1/2 cups

Bertolli® Gold Label Imported Balsamic Vinegar with Caramelized Onions, divided

1/4 tsp

Kosher salt

1 tsp

cracked black pepper

1 1/2 cups

Italian seasoned bread crumbs

1/2 cup

freshly grated parmesan cheese

chopped fresh parsley to garnish, if desired