| November 12, 2012

It's hard to beat French onion soup on a chilly day — unless it's French onion soup that has just 70 calories.

Katie Farrell of Dashing Dish showed us this delicious twist on a usually calorie-packed recipe. By using Swiss cheese, a dash of grated Parmesan and cutting out the croutons, Farrell created a comfort soup that will keep you slim during the winter months.

RECIPE: 100 Calorie Pumpkin Cinnamon Rolls

"The key to a good French onion soup is caramelizing the onions to bring out the natural sweetness," says Farrell, which is why she recommends leaving it in a slowcooker for at least four hours. Top with cheese and broil in your oven for a cheesy, crispy finish.

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70-Calorie French Onion Soup

Eight 1 and 1/2 cup Servings (Makes 12 cups total)


  • 2 large yellow onions, peeled and thinly sliced
  • 1/2 teaspoon garlic powder
  • 2 packets Stevia or 1 tablespoon sugar substitute of choice
  • 8 cups (two 32-ounce containers) organic beef broth
  • 4 tablespoons grated Parmesan cheese
  • 8 slices ultra thin swiss cheese
  • 1/2 teaspoon dried thyme
  • 2 tablespoons balsamic vinegar or Worcestershire Sauce
  • Pinch salt and pepper (to taste)


  1. Spray a large pan with nonstick cooking spray. Add onions and 1 cup beef broth and garlic powder. Saute onions until broth is completely evaporated, and onions begin to caramelize.
  2. Add the rest of the ingredients, including Parmesan cheese, to the slow cooker and add onions. Turn slow cooker on high for 4 hours, or on low for 8 hours, or overnight.
  3. When ready to serve, ladle soup into an oven (or microwave safe) bowl, and add a piece of Swiss cheese on top. Place in oven preheated to low broil to melt the cheese. Leave in oven for 1-3 minutes, or until cheese is lightly golden brown. Alternatively, you could microwave the soup for 1-3 minutes, or until the cheese is melted.