Go Back

Slow Cooker French Onion Soup


  • 3 large bouillon cubes
  • 7 1/2 cups water could also substitute with 4 14 1/2 cans ready to serve beef broth ~ omit bouilion cubes if you use the broth
  • 1 packet Au Jus seasoning mix
  • 3 large onions about 3 cups
  • 3 tablespoons margarine or butter melted
  • 3 tablespoons flour
  • 1 tablespoon worcestershire
  • 1 teaspoon sugar
  • 1 loaf French bread sliced 1" thick
  • 3/4 cups mozzarella or Swiss cheese


  • Put melted butter and onions in slow cooker. Stir so that onions are coated with margarine.
  • Cover and cook on high for 30-35 minutes, until onions begin to slightly cook.
  • Meanwhile, if using water and bouillion cubes, boil water in microwave and drop cubes into boiling water.
  • Mix together flour, Worcestershire, sugar, and pepper.
  • Pour broth, Au Jus Mix and Worcestershire mixture into crockpot. Cover and cook on low for 7-9 hours.
  • Pour soup into oven-proof bowls (if you have them!) Place on baking sheet, and put a piece of sliced bread on top of soup.
  • Cover with cheese, and broil in oven for 2-3 minutes, until cheese is bubbly
  • Cool slightly (your bowls will be hot!), and enjoy..... yummmm!