French Onion Soup with Portobello Cheese Toast

French Onion Soup with Portobello Cheese "Toast"

French Onion Soup with Portobello Cheese Toast


45 minutes

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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