Ingredients
- 24 medium cremini mushrooms (about 1 pound )
- 2 tablespoons extra-virgin olive oil , divided
- ¾ teaspoon salt , divided
- 1 tablespoon unsalted butter
- 2 large yellow onions , sliced (about 6 cups )
- 1 tablespoon sherry vinegar
- ½ cup unsalted beef broth
- 1 cup shredded Gruyère cheese
- 2 tablespoons dry whole-wheat breadcrumbs
- Fresh thyme leaves , for garnish (optional)
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