Crockpot French Onion Soup

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Slow-Cooked, Deeply Caramelized, Hands-Free Comfort

Few things feel as soothing as a bowl of slow-cooked French onion soup — golden onions melting into a rich, savory broth with a blanket of bubbling cheese on top. This crockpot version captures all the magic of the classic, but with an effortless, set-and-forget method perfect for busy days. As the onions caramelize gently over hours, the flavors turn sweet, velvety, and irresistible. Whether you’re easing into a cozy evening or feeding a hungry family, this soup delivers warmth, richness, and timeless comfort in every spoonful.

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Crockpot French Onion Soup

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Slow-cooked French Onion Soup with deeply caramelized onions, rich beef broth, toasted bread, and melty Gruyère. This recipe delivers deep flavor with almost no effort thanks to the slow cooker. Perfect for cozy nights when you want a comforting yet elegant bowl of soup.

  • Author: LORA LORA
  • Prep Time: 25 minutes
  • Cook Time: 7 hours 30 minutes
  • Total Time: 8 hours
  • Yield: 5 1x

Ingredients

Scale

2 tablespoons unsalted butter, melted
3 lbs yellow onions, thinly sliced
4 garlic cloves, minced
1 tablespoon fresh thyme leaves (or 1 teaspoon dried thyme)
1½ teaspoons kosher salt
¼ teaspoon ground black pepper
4 cups low-sodium beef broth
½ cup additional broth (any unsalted broth)
8–12 slices French bread, ¼ inch thick
3 tablespoons olive oil
½ cup shredded Gruyère cheese

Instructions

  • Add melted butter, onions, garlic, thyme, salt, and pepper to a 6-quart slow cooker. Cover and cook on high for 5–7 hours, stirring occasionally, until onions are deeply golden.

  • Stir in the beef broth and extra broth. Cover and cook on high for 30 minutes.

  • Preheat the broiler and position the oven rack 6 inches from the heat.

  • Brush bread slices with olive oil and broil 2–3 minutes per side until toasted.

  • Divide soup among oven-safe bowls. Top each bowl with toasted bread and sprinkle with Gruyère.

 

  • Broil 1–3 minutes until bubbly and golden. Serve hot.

Notes

• Caramelize onions slowly for the richest flavor.
• Store soup base (without bread or cheese) up to 4 days.
• Freeze soup base up to 6 months.
• Add fresh thyme for garnish if desired.

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Preparation Time

Preparation: 25 minutes
Cooking: 7 hours 30 minutes
Total Time: 8 hours
Servings: 5 servings

Ingredients

2 tablespoons unsalted butter, melted
3 pounds yellow onions, thinly sliced
4 garlic cloves, minced
1 tablespoon fresh thyme leaves (or 1 teaspoon dried thyme)
1 ½ teaspoons kosher salt, plus more to taste
¼ teaspoon ground black pepper
4 cups low-sodium beef broth
1/2 cup unsalted broth
8–12 slices French bread, 1/4-inch thick
3 tablespoons extra-virgin olive oil
1/2 cup shredded Gruyère cheese

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Required Utensils

This recipe doesn’t require any fancy equipment — just a few basic utensils for easy, stress-free cooking.
• Slow cooker
• Sharp knife
• Cutting board
• Measuring cups and spoons
• Wooden spoon
• Baking sheet
• Oven-safe bowls

Preparation Steps (Beginner-Friendly)

  1. Add the melted butter, onions, garlic, thyme, salt, and pepper to a 6-quart slow cooker. Cover and cook on high for 5–7 hours, stirring occasionally, until the onions turn deep golden and caramel-sweet. 😊
  2. Pour in the beef broth and unsalted broth. Stir well, cover, and cook on high for another 30 minutes so the flavors blend fully.
  3. While the soup finishes, preheat the broiler and position the oven rack about 6 inches from the top.
  4. Arrange the bread slices on a baking sheet, brush both sides with olive oil, and broil 2–3 minutes total, flipping halfway. Watch closely to avoid burning.
  5. Divide the hot soup among oven-safe bowls.
  6. Add 2–3 toasted bread slices onto each bowl and sprinkle generously with Gruyère. ✨
  7. Broil the bowls for about 2 minutes until the cheese bubbles, melts, and browns beautifully.
  8. Finish with a pinch of salt and pepper and serve warm and comforting.

Chef’s Tips

• Let the onions cook long enough to become richly caramelized — this builds most of the flavor.
• Store soup (without toppings) for up to 4 days in the fridge; reheat gently and broil the toppings fresh.
• Freeze the soup base for up to 6 months for easy meal prep.
• For a fuller finish, add an extra sprinkle of cheese after broiling.

Nutrition Information

Serving: 1
Calories: 593 kcal
Protein: 21 g
Carbs: 80 g
Fat: 20 g
Fiber: 7 g
Sugar: 17 g

Note: These values are estimated using online tools and may vary depending on the ingredients used. Consult a nutritionist for precise guidance.

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