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Slow Cooker Onion Soup with Cheese

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PREP TIME
30 min
COOKING TIME
285 min
TOTAL TIME
315 min
SERVINGS
8 servings
Soup French
Slow Cooker Onion Soup with Cheese
Ingredients
  • 6 tablespoons butter
  • 4 large yellow onions, sliced and separated into rings
  • 1 tablespoon white sugar
  • 2 cloves garlic, minced
  • 1/2 cup cooking sherry
  • 7 cups reduced-sodium beef broth
  • 1 teaspoon sea salt, or to taste
  • 1/4 teaspoon dried thyme
  • 1 bay leaf
  • 8 slices of French bread
  • 1/2 cup shredded Gruyere cheese
  • 1/3 cup shredded Emmental cheese
  • 1/4 cup freshly shredded Parmesan cheese
  • 2 tablespoons shredded mozzarella cheese
Instructions
1
Gather all the necessary ingredients beforehand.
2
Heat a generous amount of butter in a substantial, large pot over a medium-high heat setting. Add sliced onions; cook and stir constantly until they become translucent, taking approximately 10 minutes.
3
Sprinkle the cooked onions with a small amount of sugar; decrease the heat to a medium level. Cook, stirring frequently, until the onions are soft and have developed a rich caramelized flavor, which should take at least 30 minutes. Stir in minced garlic and cook until it releases a fragrant aroma, about 1 minute.
4
Add a splash of sherry into the onion mixture; scrape the bottom of the pot to dissolve any small bits of browned food that may have accumulated.
5
Transfer the cooked onions into a slow cooker and pour in beef broth. Season with a pinch of sea salt; stir in dried thyme and bay leaves.
6
Cover the slow cooker and cook on Low for 8 to 10 hours or on High for 4 to 6 hours.
7
Preheat the oven broiler about 10 minutes before serving. Position an oven rack approximately 8 inches away from the heat source. Arrange bread slices on a baking sheet; broil until toasted, 1 to 2 minutes per side.
8
Mix the Gruyere, Emmental, Parmesan, and mozzarella cheeses in a bowl.
9
Fill oven-safe soup crocks 3/4 full with the onion soup and place a bread slice in each bowl.
10
Top each bowl with about 2 tablespoons of the cheese mixture.
11
Place the filled bowls onto a baking sheet and broil until the cheese topping is lightly browned and bubbling, about 2 minutes.