Simple Onion Soup

7 ingredients
10 steps

Ingredients

  • 2 tablespoons (1/4 stick) butter
  • 2 pounds onions, thinly sliced
  • 3 14 1/2-ounce cans beef broth
  • 1/2 cup dry red wine
  • 1 1/3 cups seasoned croutons
  • 4 thin slices Swiss cheese
  • 4 tablespoons grated Parmesan cheese

Directions

  1. 1
    Melt butter in heavy large pot over medium-high heat.
  2. 2
    Add onions; cook until deep brown, stirring frequently, about 25 minutes.
  3. 3
    Add broth and wine; boil until soup is slightly reduced and flavors blend, about 10 minutes.
  4. 4
    Season with salt and pepper.
  5. 5
    Meanwhile, preheat oven to 500F.
  6. 6
    Put 4 deep ovenproof bowls on baking sheet.
  7. 7
    Put 1/3 cup croutons in each bowl.
  8. 8
    Ladle soup over croutons.
  9. 9
    Top with cheeses.
  10. 10
    Bake soup until heated through and cheeses melt, about 8 minutes.

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