Slow-Cooker French Onion Soup

Using an Instant Pot? Cook onions with sauté function, then add next 3 ingredients, seal and cook 10 min.


1 - 1 serving

Total Time

Prep Time

Cook Time


  • 2 tbsp. butter
  • 6 c. onions (2 lbs.) thinly sliced
  • 1 tbsp. all-purpose flour
  • 6 c. low-sodium beef broth divided
  • 2 tbsp. Worcestershire sauce
  • 1 tsp. dried thyme
  • 16 (1/2"-thick) slices thin baguette toasted
  • 1 c. grated Gruyère cheese


In skillet over medium-high heat, melt butter. Add onions, cook until browned, about 12 min., stirring often. Add flour; cook 1 min., stirring. Stir in 1/2 cup broth, scraping up browned bits.

Transfer mixture to 4-qt. slow cooker. Add Worcestershire, thyme, 1/2 tsp salt, 1/2 tsp. pepper, and remaining broth. Cover; cook on high 4 hrs.

Heat broiler. Line rimmed baking sheet with foil; coat with cooking spray. Arrange toasts on baking sheet. Top each with 1 tbs. cheese. Broil 1-2 min. until golden brown. 

Divide soup among cups or bowls; top with toasts.

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