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French Onion Soup Casserole

RecipeLion.com Test Kitchen
  • 100 minutes
  • Serves

INGREDIENTS

3

Sweet onions, medium

4 cups

Beef broth

1 tsp

Worcestershire sauce

6

slices French bread

3 tbsp

Butter

1 cup

Mozzarella cheese

1/2 cup

Parmesan cheese, grated