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French Onion Soup With Portobello Cheese "Toast"

Ingredients

• 4 tablespoons extra-virgin olive oil, divided
• 2 tablespoons butter
• 2 large sweet onions, sliced
• 1 medium red onion, sliced
• 4 medium portobello mushrooms, stems and gills removed
• ½ teaspoon ground pepper, divided
• 2 tablespoons chopped garlic
• 2 teaspoons chopped fresh thyme or 1/2 teaspoon dried
• ¼ cup dry sherry
• ½ teaspoon salt
• 4 cups unsalted beef broth
• ½ cup shredded Gruyère cheese
• ¼ cup plain dry breadcrumbs
• 1 tablespoon minced fresh chives

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