Slow Cooker Onion Soup

Slow Cooker Onion Soup

Plain ole Bob 6

"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."


4 h 30 m servings 498 cals
Serving size has been adjusted!

Original recipe yields 3 servings



  • Calories:
  • 498 kcal
  • 25%
  • Fat:
  • 29.3 g
  • 45%
  • Carbs:
  • 30.6g
  • 10%
  • Protein:
  • 16.8 g
  • 34%
  • Cholesterol:
  • 62 mg
  • 21%
  • Sodium:
  • 1044 mg
  • 42%

Based on a 2,000 calorie diet

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  • Prep

  • Cook

  • Ready In

  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.


  • Easy Cleanup
  • Try using a liner in your slow cooker for easier cleanup.



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 a...

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...

Very good and rich.

I cooked this on low 8 hours over night, prep it & put it in the crock pot before I went to sleep. Just woke up to this & had to try it. More salt! I added 1/2 a tsp & it still needs more. I ski...

I had this for lunch today. We had made it a few weeks ago and froze it (cheese, croutons, soup). Had I known it would be this amazing, I would have had some way before today!! LOL.... The bes...

Easy and delicious. I have made this several times. I have made it with both croutons and French bread, and surprisingly I prefer the croutons for the extra seasoning.

This was my first attempt at onion soup. I must say, I was very impressed! It's delicious! Only things I did differently was add a can of beef consumme, and cook it on low for 8 hours. I wou...

I am a huge fan of French onion soup. This is one of the best I've had! And soo easy to make