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Dinner Recipes

Slow-Cooker French Onion Soup

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

Serving Size:


Active Time:

30 min.

Total Time:

4½ hrs.


  • 2 Tbs. butter
  • 6 cups onions (2 lbs.), thinly sliced
  • 1 Tbs. all-purpose flour
  • 6 cups low-sodium beef broth, divided
  • 2 Tbs. Worcestershire sauce
  • 1 tsp. dried thyme
  • 16 (½”-thick) slices thin baguette, toasted
  • 1 cup grated Gruyère cheese


  1. 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 ½  cup broth, scraping up browned bits.
  2. Transfer mixture to 4-qt. slow cooker. Add Worcestershire, thyme, ½ tsp. salt, ½ tsp. pepper and remaining broth. Cover; cook on high 4 hrs.
  3. 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. Divide soup among cups or bowls; top with toasts.

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