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Slow Cooker French Onion Soup

Total Time7 hours
Course: Dinner, Entree, Lunch, Main Course, Side Dish, Soup
Cuisine: French
Servings: 6

Ingredients

  • 2 lbs yellow onions, thinly sliced
  • ¼ c unsalted butter, melted
  • 1½ tsp sugar
  • 1½ tsp kosher salt
  • ½ tsp ground black pepper
  • 1 dried bay leaf
  • 5 c low-sodium beef broth
  • 1 tbsp dry white wine
  • 12 baguette slices (½" thick)
  • 6 oz shredded Gruyere cheese
  • 3 tbsp cognac, optional

Instructions

  • Thinly slice onions. Melt butter. Stir together onions, melted butter, sugar, salt and pepper in a 4-quart slow cooker until onions are fully coated. Place bay leaf on onion mixture.
  • Cover and cook on High, stirring once halfway through, until onions are deep golden brown and caramelized, 6-7 hours.
  • Remove and discard bay leaf. Stir in broth and wine. Cover and cook on High until thoroughly heated, about 30 minutes. Just before serving, stir in the cognac.
  • Slice baguette and shred cheese. Preheat oven to broil, with over rack about 6" from heat. Spoon soup into 6 ovenproof ramekins placed on a rimmed baking sheet. Top each ramekin with 2 baguette slices; divide cheese evenly among ramekins.
  • Broil until cheese is melted and golden brown, about 3 minutes. Serve immediately.