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5 from 6 votes

French Onion Soup

So good that friends will beg you for the recipe!
Prep Time15 mins
Cook Time1 hr
Total Time1 hr 15 mins
Course: Main Course
Cuisine: American
Keyword: french onion soup
Servings: 4 servings
Calories: 938kcal
Author: Amanda Rettke--iambaker.net



  • 4 tablespoons Challenge salted butter
  • 1 teaspoon kosher salt
  • 2 large red onions (about 5 cups), thinly sliced
  • 2 large sweet onions (about 5 cups), thinly sliced
  • 1 can (32 ounces) chicken broth
  • 1 can (32 ounces) beef broth
  • ½ cup red wine
  • 1 tablespoon Worcestershire sauce
  • 2 sprigs fresh parsley
  • 1 sprig fresh thyme leaves
  • 1 tablespoon balsamic vinegar
  • salt and freshly ground black pepper, to taste


  • 4 cups large homemade croutons
  • 2 cups shredded Gruyere Cheese
  • 2 cups shredded Asiago



  • Melt butter in a large pot or Dutch Oven over medium-high heat.
  • Stir in salt, red onions and sweet onions. Cook 35 minutes, stirring occasionally, until onions are sticky and almost syrupy. (Onions will be translucent.)
  • Add in the chicken broth, beef broth, red wine, and Worcestershire sauce into the pot.
  • Bundle the parsley and thyme with twine and place in pot. Simmer over medium heat for about 20 minutes, stirring occasionally. Remove and discard the herbs.
  • Reduce the heat to low, mix in balsamic vinegar and season with salt and pepper. Simmer 5 minutes.


  • Preheat oven broiler.
  • Arrange 4 large oven safe bowls or crocks on a rimmed baking sheet. Fill each bowl 2/3 full with hot soup. 
  • Top each bowl with 5-6 toasted croutons, 1/2 cup Gruyere cheese and 1/2 of the Asiago cheese
  • Broil 4-5 minutes, or until bubbly and golden brown. Keep a close eye on them!
  • Serve immediately.



Serving: 4g | Calories: 938kcal