Slow Cooker Onion Soup

Slow Cooker Onion Soup

7 Reviews 1 Pic
  • Prep

    15 m
  • Cook

    4 h 15 m
  • Ready In

    4 h 30 m
Plain ole Bob
Recipe by  Plain ole Bob

“This is about the best onion soup I've been able to come up with. Tastes better than any restaurant onion soup I've ever had.”

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Adjust Servings

Original recipe yields 3 servings



  1. Melt butter in a skillet over medium heat; cook and stir sweet onion and red onion in melted butter until softened, about 10 minutes. Cook and stir garlic into onion mixture until fragrant, about 2 minutes. Transfer to a slow cooker.
  2. Pour beef stock, brandy, soy sauce, and Worcestershire sauce into slow cooker. Season with salt and black pepper.
  3. Cook soup on High for 4 to 5 hours.
  4. Preheat the oven's broiler and set the oven rack about 6 inches from the heat source.
  5. Ladle the soup into 3 oven-proof bowls; top with croutons and a slice of Provolone per bowl.
  6. Broil in the preheated oven until cheese melts and begins to brown, about 3 minutes.

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Reviews (7)

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Sarah Jo

Sarah Jo

Surprizingly good--even my husband, who is a french onion soup snob, liked it. I was surprized that a french onion soup could be this good from a crockpot. I used a quality brand beef stock, I added some fresh ground pepper when I sauteed the onions/garlic and I made my own homemade croutons. Next time, I think I would use all sweets and maybe add one more onion but that's honestly a personal preferance, not a reflection of the recipe. I'd make this again.



This was tasty! It was definitely easier than making onion soup the traditional way...I did feel that it was a bit on the thin side, though. I only used sweet onion and more than called for. The flavor was nice! This won't replace my usual onion soup recipe, but for quickness and ease, this was great! I may even try to use this method w/ my usual recipe, b/c the concept is just great. I made my own 'croutons', using sliced baguette that I toasted on each side and then rubbed w/ a clove of fresh garlic, and I used swiss just b/c that's what I always use when I make onion soup. All in all this was good and I would def make it again, with a few minor adjustments! Thanks for sharing. :)



Very good and rich.

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Amount Per Serving (3 total)

  • Calories
  • 498 cal
  • 25%
  • Fat
  • 29.3 g
  • 45%
  • Carbs
  • 30.6 g
  • 10%
  • Protein
  • 16.8 g
  • 34%
  • Cholesterol
  • 62 mg
  • 21%
  • Sodium
  • 1173 mg
  • 47%

Based on a 2,000 calorie diet



previous recipe:

Slow Cooker, Easy Baked Potato Soup


next recipe:

Lorene's Slow Cooker Potato Soup