Crockpot French Onion Soup

Course Crockpot
Prep Time 30 minutes
Cook Time 5 hours
Total Time 5 hours 30 minutes
Servings 8 servings
Author Adapted from Allerecipes


  • 6 tablespoons butter
  • 4 large yellow onions sliced and separated into rings
  • 1 tablespoon white sugar
  • 2 cloves garlic minced
  • 1/2 cup cooking sherry
  • 7 cups beef broth
  • 1 teaspoon sea salt or to taste
  • 1/4 teaspoon dried thyme
  • 1 bay leaf
  • french bread optional
  • provolone cheese optional


  1. Heat butter in a large, heavy pot over medium-high heat; cook and stir onions until they become translucent, about 10 minutes.
  2. Sprinkle onions with sugar; reduce heat to medium.
  3. Cook, stirring constantly, until onions are soft and browned, at least 30 minutes.
  4. Stir in garlic and cook until fragrant, about 1 minute.
  5. Stir sherry into onion mixture and scrape bottom of pot to dissolve small bits of browned food from the pot.
  6. Transfer onions into a slow cooker and pour in beef broth.
  7. Season to taste with sea salt; stir in thyme and bay leaf.
  8. Cover cooker, set on High, and cook 4 to 6 hours.
  9. If desired, set on Low and cook 8 to 10 hours.
  10. About 10 minutes before serving if putting bread and cheese on, set oven rack about 8 inches from the heat source and preheat the oven's broiler.
  11. Arrange bread slices on a baking sheet.
  12. Broil bread slices until toasted, 1 to 2 minutes per side.
  13. Fill oven-safe soup crocks 3/4 full of onion soup and float a bread slice in each bowl.
  14. Top with 1 slice of cheese on each soup.
  15. Place filled bowls onto a baking sheet and broil until cheese topping is lightly browned and bubbling, about 2 minutes.