Easy Slow Cooker French Onion Soup Recipe

Ingredients

• 6 tablespoons butter
• 4 large yellow onions, sliced and separated into rings
• 1 tablespoon white sugar
• 2 cloves garlic, minced
• 0.5 cup cooking sherry
• 7 cups reduced-sodium beef broth
• 1 teaspoon sea salt, or to taste
• 0.25 teaspoon dried thyme
• 1 bay leaf
• 8 slices of French bread
• 0.5 cup shredded Gruyere cheese
• 0.33 cup shredded Emmental cheese
• 0.25 cup freshly shredded Parmesan cheese
• 2 tablespoons shredded mozzarella cheese

Instructions

1. Gather all ingredients.
2. Melt butter in a large, heavy pot over medium-high heat. Add onions; cook and stir until translucent, about 10 minutes.
3. Sprinkle onions with sugar; reduce heat to medium. Cook, stirring constantly, until onions are soft and caramelized, at least 30 minutes. Stir in garlic and cook until fragrant, about 1 minute.
4. Stir sherry into onion mixture; scrape the bottom to dissolve the small bits of browned food.
5. Transfer onions into a slow cooker and pour in beef broth. Season with sea salt; stir in thyme and bay leaf.
6. Cover 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. Set an oven rack about 8 inches from the heat source. Arrange bread slices on a baking sheet; broil until toasted, 1 to 2 minutes per side.
8. Lightly toss Gruyere, Emmental, Parmesan, and mozzarella cheeses in a bowl.
9. Fill oven-safe soup crocks 3/4 full with onion soup and float a bread slice in each bowl.
10. Top each with about 2 tablespoons cheese mixture.
11. Place filled bowls onto a baking sheet and broil until cheese topping is lightly browned and bubbling, about 2 minutes.

Nutrition

• Calories: 442 kcal
• Fat Content: 16 g
• Fiber Content: 3 g
• Sugar Content: 10 g
• Sodium Content: 1540 mg
• Protein Content: 18 g
• Cholesterol Content: 38 mg
• Carbohydrate Content: 57 g
• Saturated Fat Content: 9 g
• Unsaturated Fat Content: 0 g