Real Recipes From Real Home Cooks ®

slow cooker french onion soup

Recipe by
Teresa G.
Here, KY

I love French onion soup, but I don't love the traditional way of making it, so I came up with my own, much easier, recipe. It tastes just as good as any I've ever had. Soft, sweet onions in a hearty, dark and rich broth with great depth of flavor, topped with a slice of buttered toast covered with gooey, bubbly cheese... yeah, it's close to Nirvana in my book.

yield 8 (approx.)
prep time 30 Min
cook time 8 Hr
method Slow Cooker Crock Pot

Ingredients For slow cooker french onion soup

  • 3 XL lg
    sweet onions, sliced (bigger than a softball or equivalent)
  • 4 can
    beef broth (14.5 oz. cans)
  • 1
    beef bouillon cube
  • 1/2 to 1 tsp
    soy sauce
  • salt to taste
  • freshly ground black pepper to taste
  • a few dash
    weber smoky truffle seasoning, optional
  • 1/4 c
  • 1 thick slice
    hearty white bread or garlic toast per serving
  • butter, softened
  • whole milk mozzarella or gruyère cheese, sliced or shredded

How To Make slow cooker french onion soup

  • Some of the ingredients for slow-cooker French onion soup.
    Gather and prep ingredients.
  • Sliced onions, salt and pepper in slow cooker.
    Into the bowl of your slow-cooker, add sliced onions, beef broth, beef bouillon cube, soy sauce and salt and pepper to taste (the marsala is added later.)
  • French onion soup in slow-cooker.
    Place lid on slow-cooker; set temperature to high; cook for 6 to 8 hours minimum (the longer, the better; I stir mine a couple of times while it's cooking.)
  • 4
    About 1/2 hour before serving, add marsala to soup; stir. Now it's time to make the topping.
  • 5
    Place soup bowls on a rimmed baking sheet (If you have onion soup bowls, now's the chance to use them.) Set aside.
  • 6
    There are several different ways to prepare and toast the bread for the topping, so choose whichever of the following that works for you: 1. Butter both sides of bread and toast in toaster oven or oven until lightly browned. 2. Toast bread in regular toaster, then butter. 3. Prepare frozen Texas Garlic Toast according to package instructions.
  • 7
    There are a couple of different ways to finish the topping. 1. Place prepared toast on a baking sheet, top toast with sliced or shredded cheese, then broil until cheese is bubbly and browned around the edges. Place one piece on top of each bowl filled (don't overfill!) with hot onion soup. Serve immediately. 2. Preheat oven to 450 degrees F (if your bowls are broiler-safe, set oven to broil.) Fill bowls with hot onion soup; place toast on top of soup; cover toast with cheese, then bake/broil until cheese is bubbly. Serve immediately.
  • 8
    Refrigerate or freeze any leftover soup.