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Cozy Slow Cooker French Onion Soup Recipe with Melted Gruyère Cheese

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A comforting slow cooker French onion soup featuring deeply caramelized onions and topped with melted Gruyère cheese, perfect for cozy nights and family gatherings.

Ingredients

Scale
  • 6 large yellow onions, thinly sliced (about 3 pounds / 1.4 kg)
  • 4 tablespoons unsalted butter
  • 2 tablespoons olive oil
  • 3 garlic cloves, minced
  • 6 cups beef broth (1.4 liters), low-sodium recommended
  • 1 cup dry white wine (240 ml)
  • 2 bay leaves
  • 4 sprigs fresh thyme or 1 teaspoon dried thyme
  • Salt and black pepper, to taste
  • Baguette slices, toasted
  • 2 cups shredded Gruyère cheese (about 200g)

Instructions

  1. Peel and thinly slice about 6 large yellow onions (around 3 pounds / 1.4 kg). Aim for even slices so they cook uniformly. This step takes about 10-15 minutes.
  2. Heat 4 tablespoons unsalted butter and 2 tablespoons olive oil in a large skillet over medium-low heat. Add the sliced onions and a pinch of salt. Cook slowly, stirring often, for 25-30 minutes until golden brown and soft. If onions start sticking or browning too fast, lower the heat and add a splash of water.
  3. Stir in 3 minced garlic cloves and cook for another 1-2 minutes until fragrant. Avoid burning the garlic.
  4. Carefully transfer the caramelized onions and garlic into your slow cooker.
  5. Pour in 6 cups (1.4 liters) of beef broth and 1 cup (240 ml) dry white wine. Add 2 bay leaves and 4 sprigs fresh thyme (or 1 tsp dried). Season lightly with salt and black pepper. Stir gently.
  6. Set slow cooker to low and cook for 6-8 hours. For shorter time, cook 4 hours on high but flavor will be less rich.
  7. About 15 minutes before serving, preheat oven to 400°F (200°C). Slice baguette into 1/2-inch (1.3 cm) thick rounds and toast until golden and crisp, about 5-7 minutes.
  8. Ladle hot soup into oven-safe bowls. Place toasted baguette slices on top and cover generously with shredded Gruyère (about 1/3 cup / 65 g per bowl). Place bowls on a baking sheet and broil for 3-5 minutes until cheese is bubbly and golden brown. Watch carefully to prevent burning.
  9. Carefully remove from oven and serve hot immediately.

Notes

If slow cooker lid doesn’t seal tightly, check soup occasionally to prevent evaporation and add broth or water if too thick. Remove bay leaves and thyme stems before serving. For vegetarian version, use vegetable broth and vegan cheese. For gluten-free, replace baguette with gluten-free bread. Watch broiler carefully when melting cheese to avoid burning.

Nutrition

Keywords: French onion soup, slow cooker soup, Gruyère cheese, caramelized onions, comfort food, easy soup recipe, cozy dinner

Find it online: https://zorbmeal.com/cozy-slow-cooker-french-onion-soup-recipe-with-melted-gruy-e-re-cheese/